With 100 days to go until Election Day 2014, control of the Senate is firmly up for grabs.

Red-state Democrats are hanging tough despite a toxic environment, but Republicans are hopeful about late-breaking opportunities in a pair of swing states.

The GOP needs to net six seats for Senate control and already have a trio of conservative open seats in the bag. Now, the real battle turns to fights in more than a half-dozen other states.

ADVERTISEMENT

“It's an even bet that Republicans get the Senate,” said Cook Political Report Senate editor Jennifer Duffy.

On the House side, Republicans are a lock to remain in power. The real test is whether they can expand their majority.

Fight for the Senate

The battle for Senate control is on conservative terrain. Seven Democratic-held seats are in states 2012 presidential nominee Mitt Romney carried, while the GOP has no vulnerable blue-state incumbents.

Republicans are heavily favored to pick off seats of retiring Democrats in West Virginia and South Dakota, and appointed Sen. John Walsh’s (D-Mont.) recent plagiarism scandal has likely doomed his already-uphill race.

The best news for Democrats is that their four red-state incumbents are running strong campaigns and can’t be counted out just yet. 

Sens. Kay HaganKay Ruthven HaganWarning signs flash for Tillis in North Carolina Tillis trails Democratic challenger by 7 points in North Carolina poll North Carolina businessman will challenge Tillis in GOP primary MORE (D-N.C.) and Mark BegichMark Peter BegichAlaska political mess has legislators divided over meeting place Former GOP chairman Royce joins lobbying shop Lobbying world MORE (D-Alaska) seem to have the edge in their races, Sen. Mark PryorMark Lunsford PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.) is hanging tough, and Sen. Mary LandrieuMary Loretta LandrieuCongress needs to work to combat the poverty, abuse and neglect issues that children face Dems wrestle over how to vote on ‘Green New Deal’ Lobbying world MORE (D-La.) isn’t dead yet.

Hagan's approval ratings are low, but state House Speaker Thom Tillis (R) is even less popular, and public and private polls both show her ahead. 

Tillis has been trapped in an extended legislative session as unpopular GOP lawmakers war over the state budget, and Hagan has a four-to-one cash advantage.

“Tillis has to put this legislative fight behind him. He's got to move on. He's struggled,” admitted one national GOP strategist.

Begich also appears to be in good shape in a tough state. His attacks on GOP primary front-runner Dan Sullivan have taken a toll and could hurt him in his August primary, too.  

“Begich is running the best race of any Democrat right now,” said another national Republican consultant. “In Alaska it's tough to see the path to victory until this primary plays itself out.”

Pryor has stayed alive because of Cotton’s unbending conservatism, most notably his vote against the Farm Bill. Both parties say they have a small advantage in the race and each have polls to back those claims.

Democrats admit Landrieu is their most vulnerable incumbent. It will be hard for her to reach the 50 percent threshold needed to avoid a December runoff with two GOP candidates on the ballot. If that scenario plays out, Republicans believe Rep. Bill Cassidy (R-La.) holds the edge in a runoff, especially if Senate control remains undecided after November. 

While Republicans have failed to knock out the incumbents some predicted would be underwater by this point in the election cycle, Rep. Bruce BraleyBruce Lowell Braley2020 caucuses pose biggest challenge yet for Iowa's top pollster OPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward MORE’s (D-Iowa) missteps have given Democrats severe heartburn in that open seat race, and Rep. Cory GardnerCory Scott GardnerTrump's GOP impeachment firewall holds strong GOP braces for impeachment brawl Republicans wrestle with impeachment strategy MORE (R-Colo.) is also running strong against Sen. Mark UdallMark Emery UdallPoll: Trump trails three Democrats by 10 points in Colorado The Hill's Morning Report — Trump and the new Israel-'squad' controversy Colorado candidates vying to take on Gardner warn Hickenlooper they won't back down MORE (D-Colo.).

“We really have already expanded the field…. A year ago we weren't even talking about those races. We were talking about having to win three of four open seats,” Carl Forti, the political director of the GOP super-PAC American Crossroads, told The Hill. 

Braley damaged himself with comments that as a trial lawyer he’s more qualified than popular Sen. Charles GrassleyCharles (Chuck) Ernest GrassleyGOP braces for impeachment brawl PhRMA CEO warns Pelosi bill to lower drug prices would be 'devastating' for industry GOP requests update on criminal referrals prompted by 2018 Kavanaugh probe MORE (R-Iowa), “a farmer from Iowa who never went to law school,” to serve on the Senate Judiciary Committee.

Iowa state Sen. Joni Ernst (R) has run a strong race so far, and Democrats admit Braley’s lackluster campaign is cause for alarm.

“Braley has shot himself in the foot again and again. We have a lot of work to do. Iowa is a lot closer than we want it to be,” said one national Democrat.

Gardner’s entrance into the race earlier this year put Colorado on the Senate map. Democrats think Udall’s attacks on social issues have paid dividends, though Udall has squirmed on some controversial environmental issues. Recent public surveys show a dead-even race, but private polling from both sides show the incumbent up slightly. 

Colorado and Iowa look like barn-burners, but other Republican targets are slipping down the priority list.

Rep. Gary Peters (D-Mich.) has opened a steady lead over former Michigan Secretary of State Terri Lynn Land (R) and Sen. Scott Brown’s (R-Mass.) campaign hasn’t taken off against Sen. Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenOvernight Energy: Advisory panel pushes park service to privatize campgrounds | Dems urge Perry to keep lightbulb efficiency rules | Marshall Islands declares national climate crisis Democrats urge Rick Perry not to roll back lightbulb efficiency rules Overnight Health Care — Presented by Coalition Against Surprise Medical Billing — Planned Parenthood charges into 2020 | PhRMA CEO warns against Pelosi drug pricing bill | Medicaid work requirements costing states millions MORE (D-N.H.) in the way Republicans had hoped. The GOP still mentions Oregon, Virginia, and Minnesota as possible opportunities, but Democrats appear to be comfortably ahead in those states.

Democrats are upbeat about Georgia, where charity executive Michelle Nunn (D) has impressed. Businessman David Perdue (R) just won the GOP nomination after a protracted runoff, but Democrats believe they can pick apart his business record. Most recent public polling has found Nunn ahead in the race, though many of those same pollsters missed in the primary. Perdue likely has a slight edge.

Democrats also think the race against Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellTrump-GOP tensions over Syria show signs of easing Trump again vetoes resolution blocking national emergency for border wall Trump invites congressional leaders to meeting on Turkey MORE (R-Ky.) will be close, though Republicans scoff at the idea that Kentucky Secretary of State Alison Lundergan Grimes (D) can win. 

The bottom line — the GOP’s math to the majority gets much rockier if they lose either of those Southern seats.  

House race battles

The big question in the lower chamber is whether Republicans can make major gains on their majority or whether Democrats can fight to a draw.

Democrats privately admit that the midterm atmosphere gives the GOP the advantage, with President Obama’s numbers in the tank in many districts. Freshmen rode his 2012 coattails, but now turnout is likely to drop.

They counter that House Republicans are just as toxic, and point out the map has few competitive races anyway due to gerrymandering.  Right now, the most likely scenario is the GOP picking up a handful of seats but a good night for Democrats may be cutting into the GOP’s majority at all, but still falling far short of the 17 seats they need. 

Republicans have locks on the seats of retiring Reps. Jim MathesonJames (Jim) David MathesonTrump EPA eases standards for coal ash disposal Utah redistricting reform measure likely to qualify for ballot Trump's budget targets affordable, reliable power MORE (D-Utah) and Mike McIntyre (D-N.C.), Democrats will likely pick up retiring Rep. Gary Miller’s (R-Calif.) seat, and have the edge against scandal-plagued Rep. Michael Grimm (R-N.Y.).

After that, there are about ten Democrats, mostly freshmen, in coin-flip races, with Reps. Scott Peters (D-Calif.), Ron BarberRonald (Ron) Sylvester BarberKavanaugh nomination a make or break moment to repeal Citizens United Latina Leaders to Watch 2018 Principles and actions mean more than Jeff Flake’s words MORE (D-Ariz.) and Nick RahallNick Joe RahallWe shouldn't allow politics to impede disaster relief Break the cycle of partisanship with infant, child health care programs Clinton mulls role in 2018 midterms MORE (D-W.Va.) at the top of the list.

“As voters coast to coast question President Obama’s leadership and competence, they are responding to the message Republicans candidates are running on to provide a proper check and balance on an administration that can’t seem to walk and chew gum at the same time,” National Republican Congressional Committee spokesman Daniel Scarpinato said.

Democrats feel good about their chances against Reps. Mike Coffman (R-Colo.) and Steve Southerland (R-Fla.) as well as in retiring Rep. Tom Latham’s (R-Iowa) open seat.

“Democrats are fighting for the middle class while House Republicans are stacking the deck for their special interest buddies and shutting down the government. When voters ask who's on their side this November the answer will be clear: House Democrats. And that's why we'll be sending Republicans home in November,” Democratic Congressional Campaign Committee spokeswoman Emily Bittner said.