Dems can hold Senate

The early 2012 conventional wisdom was that Republicans would easily take control of the Senate this November. It was a perfectly reasonable supposition — 23 Democratic seats are up for reelection, with the GOP defending just 10. Given that Republicans need a net pickup of only four seats for an outright majority, the numbers appeared to be squarely in their favor.  

But elections have a funny way of confounding even the surest predictions, and it’s increasingly evident that Mitch McConnellAddison (Mitch) Mitchell McConnellGOP lawmakers want Trump to stop bashing Congress Parkland father calls out Trump, McConnell, Ryan after Santa Fe shooting Overnight Finance: House rejects farm bill in conservative revolt | NAFTA deal remains elusive as talks drag on | Dodd-Frank rollback set for House vote MORE might want to hold off on ordering those new business cards.

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Six of the seats where Democrats are playing defense are in red states, and one of them is Missouri Sen. Claire McCaskillClaire Conner McCaskillCalif. gov candidates battle for second place Senate panel advances Trump's CIA nominee Five votes to watch in fight over Trump's CIA nominee MORE’s. McCaskill remains the most endangered Democratic incumbent, her hopes resting on a nasty GOP primary that might produce a weakened opponent. And in Nebraska, Democratic former Senator and Gov. Bob Kerrey trails badly, although he’s making Republicans spend money in a state they had chalked up in the win column just a few months ago.

But in North Dakota, where Republicans thought they had an easy pickup when Sen. Kent Conrad retired, former Attorney General Heidi HeitkampMary (Heidi) Kathryn HeitkampOvernight Defense: Senate confirms Haspel as CIA chief | Trump offers Kim 'protections' if he gives up nukes | Dem amendments target Trump military parade Hillicon Valley: Lawmakers target Chinese tech giants | Dems move to save top cyber post | Trump gets a new CIA chief | Ryan delays election security briefing | Twitter CEO meets lawmakers Senate confirms Haspel to head CIA MORE leads in the early polling. And West Virginia’s Joe ManchinJoseph (Joe) ManchinTrump to hold Nashville rally amid efforts to boost GOP Senate hopeful Voters Dems need aren't impressed by anti-waterboarding showboating Overnight Finance: House rejects farm bill in conservative revolt | NAFTA deal remains elusive as talks drag on | Dodd-Frank rollback set for House vote MORE is headed toward an easy reelection after narrowly winning the seat in a 2010 special election. 

The final two Democratic seats in red states, Montana and Virginia, are both neck and neck — same as they were in 2006, when their outcome decided control of the Senate. We could see a repeat this November. 

Republicans have targeted open Democratic seats in New Mexico and Wisconsin, both fiercely competitive. However, Wisconsin will be far less competitive if Republican primary voters reject their best candidate, moderate former Gov. Tommy Thompson. 

Beyond that, Republican challenges to Democratic incumbents in Florida, Michigan, Ohio and Pennsylvania all appear to be fizzling. Florida Republicans have failed to recruit a top-tier challenger to Sen. Bill NelsonClarence (Bill) William NelsonOvernight Defense: Senate confirms Haspel as CIA chief | Trump offers Kim 'protections' if he gives up nukes | Dem amendments target Trump military parade Hillicon Valley: Lawmakers target Chinese tech giants | Dems move to save top cyber post | Trump gets a new CIA chief | Ryan delays election security briefing | Twitter CEO meets lawmakers Senate confirms Haspel to head CIA MORE, who has commanding leads in polling. Ditto with Pennsylvania. In Michigan, former GOP Rep. Pete Hoekstra cratered after airing a racist attack ad during the Super Bowl, and never recovered in his bid to unseat Sen. Debbie StabenowDeborah (Debbie) Ann StabenowThe Hill's Morning Report - Sponsored by CVS Health - A pivotal day for House Republicans on immigration GOP, Dem lawmakers come together for McCain documentary Dem presidential hopefuls flock to Trump country MORE. And in Ohio, no non-presidential candidate has faced more negative super-PAC money than Sen. Sherrod BrownSherrod Campbell BrownHillicon Valley: Facebook, Google struggle to block terrorist content | Cambridge Analytica declares bankruptcy in US | Company exposed phone location data | Apple starts paying back taxes to Ireland Overnight Health Care — Sponsored by PCMA — Trump hits federally funded clinics with new abortion restrictions Senate Dems call for probe into why Trump has not issued Russia sanctions MORE, yet he has weathered at least $5 million in attacks with limited erosion in support. 

As of today, that means the GOP is favored in two states and faces toss-up battles in perhaps five more. Remember, they only need four of those to win control, but that’s assuming they don’t lose any seats.

And make no mistake — the Democrats are also playing offense. 

There’s a real fight in Massachusetts, where Republican fluke Sen. Scott Brown is facing grassroots superstar Elizabeth WarrenElizabeth Ann WarrenElizabeth Warren urges grads to fight for 'what is decent' in current political climate Tomi Lahren responds to genealogist's investigation of her family: 'She failed miserably' GOP, Dem lawmakers come together for McCain documentary MORE. In Maine, left-leaning independent and former Gov. Angus KingAngus Stanley KingOvernight Health Care — Sponsored by PCMA — Trump hits federally funded clinics with new abortion restrictions Dem senators ask drug companies to list prices in ads Overnight Health Care: Trump unveils plan to lower drug prices | Dem questions drug company's payment to Trump attorney | House panel unveils opioid proposals MORE is likely to capitalize on Republican Sen. Olympia Snowe’s retirement.

Democrats are also competitive in Nevada and Arizona, where changing demographics are transforming the political landscape. 

And then there’s Indiana, which really should be safely Republican. Yet conservatives gifted Democrats with an opening by ousting longtime incumbent Dick Lugar in the GOP primary. Democratic nominee Joe DonnellyJoseph (Joe) Simon DonnellyVoters Dems need aren't impressed by anti-waterboarding showboating Overnight Defense: Senate confirms Haspel as CIA chief | Trump offers Kim 'protections' if he gives up nukes | Dem amendments target Trump military parade Hillicon Valley: Lawmakers target Chinese tech giants | Dems move to save top cyber post | Trump gets a new CIA chief | Ryan delays election security briefing | Twitter CEO meets lawmakers MORE, a sacrificial lamb against Lugar, is even money against conservative darling Richard Mourdock. 

With Democrats in good position to take two Republican seats, and competitive in three more, it’s clear that the GOP’s path to the Senate majority is a whole lot more treacherous than it seemed a few short months ago.

Moulitsas is the publisher and founder of Daily Kos (dailykos.com).