The Democratic Senatorial Campaign Committee is knocking Republicans for what they're calling the party's "recruiting nightmare" for Senate races, noting in a memo obtained by The Hill that Republicans faced a number of recruiting losses this week.

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“The recruiting nightmare continues to embarrass national Republicans with this week possibly being one of the worst yet after major failures in Colorado, Iowa, North Carolina, and Alaska, ” DSCC spokesman Justin Barasky said in the memo.

Even as Democrats struggle to find their own top-notch Senate talent in key states, the DSCC memo highlights serious Republican recruiting challenges in four states: Colorado, North Carolina, Iowa and Alaska.

In Colorado, Rep. Cory GardnerCory Scott GardnerSenate Republicans running away from Alabama abortion law Frustrated GOP senators want answers from Trump on Iran Graham: Trump officials not adequately briefing on Iran threat MORE (R) opted against challenging Sen. Mark UdallMark Emery UdallDenver Post editorial board says Gardner endorsement was 'mistake' Gardner gets latest Democratic challenge from former state senator Setting the record straight about No Labels MORE (D), a choice that leaves the GOP without its strongest potential candidate and without any clear contenders for the seat. 

Udall has long been considered one of the safer incumbent Democratic senators, however, and Gardner looks more likely to challenge Sen. Michael BennetMichael Farrand BennetCNN's O'Rourke town hall finishes behind Fox News, MSNBC The Hill's Morning Report - White House, Congress: Urgency of now around budget Overnight Energy: Warren wants Dems to hold climate-focused debate | Klobuchar joins candidates rejecting fossil fuel money | 2020 contender Bennet offers climate plan MORE (D) when he's up in 2016.

North Carolina Labor Commissioner Cherie Berry (R) decided not to run for Sen. Kay HaganKay Ruthven HaganNorth Carolina businessman will challenge Tillis in GOP primary Embattled senators fill coffers ahead of 2020 NC state senator meets with DSCC as Dems eye challenge to Tillis MORE's (D) seat in 2014, eliminating what had been the GOP's top contender against the incumbent, according to a recent poll.

The Republican Party continues to search for its candidate in Iowa, after a number of potential contenders turned down the opportunity to challenge likely Democratic nominee Rep. Bruce BraleyBruce Lowell BraleyOPINION | Tax reform, not Trump-McConnell feuds, will make 2018 a win for GOP Ten years later, House Dems reunite and look forward Trump: Ernst wanted 'more seasoning' before entertaining VP offer MORE (D) for retiring Sen. Tom HarkinThomas (Tom) Richard HarkinStop asking parents to sacrifice Social Security benefits for paid family leave The FDA crackdown on dietary supplements is inadequate Wisconsin lawmaker refuses to cut hair until sign-language bill passes MORE's (D) seat.

On Wednesday, Iowa Secretary of State Matt Schultz also announced his decision not to run, leaving a handful of relatively unknown potential and declared candidates.

And in Alaska, former Senate candidate Joe Miller reportedly filed papers to run again in 2014. Miller defeated Sen. Lisa MurkowskiLisa Ann MurkowskiOvernight Energy: Park Service plans to pay full-time staff through entrance fees | Oil companies join blitz for carbon tax | Interior chief takes heat for saying he hasn't 'lost sleep' over climate change Democrats grill Trump Interior chief for saying he hasn't 'lost sleep' over climate change Congress must press Interior secretary to act on climate change MORE (R) in a 2010 primary but ultimately losing the general after she launched a successful write-in campaign. 

He is seen unfavorably by 49 percent of Alaskans, according to a recent Republican poll, and some Republicans worry he could undermine their chances at a winnable seat currently held by Democratic Sen. Mark BegichMark Peter BegichFormer GOP chairman Royce joins lobbying shop Lobbying world Dem governors on 2020: Opposing Trump not enough MORE.

“The NRSC and Karl Rove are failing in their promise to handpick candidates as they continue losing top recruits across the map. The past week alone is a perfect example of how the GOP’s inability to recruit electable candidates, expand the map, and avoid contentious primaries will plague their chances to take back the majority," Barasky adds.

Republican officials fired back at the Democratic claims the GOP is suffering from a chronic recruitment problem. 

"99.99% of Republicans in America aren't running for Senate next year, yet each time one confirms that reality, the clapping monkeys at the Democratic Senatorial Campaign Committee smash their cymbals," said National Republican Senatorial Committee spokeswoman Brook Hougesen.

"As far as Republican recruitment, in the post Citizens United world, it is far more important to do our due diligence and take the time to find right candidate than it is to rush through the process and fail as the Democrats have done."

Republicans largely agree that contentious primaries that resulted in weak candidates cost the GOP a number of winnable Senate seats last cycle, and the party pledged to make an extra effort to elect the most electable conservative candidates in 2014.

Democrats are facing a difficult 2014 map that will require them to defend more seats than Republicans — including a number in states that Mitt Romney won in 2012. But they are hoping that Republicans' early recruiting difficulties indicate the GOP is in for a replay of the 2012 cycle.

Democrats, meantime, have had recruiting difficulties of their own that could jeopardize their chances at defending seats in South Dakota and West Virginia, and of picking up a seat in Georgia.

Their top recruits passed on running in South Dakota and Georgia, and they have yet to front a candidate against Rep. Shelley Moore CapitoShelley Wellons Moore CapitoCongress, White House near deal on spending, debt limit GOP presses Trump to make a deal on spending Congressional Women's Softball team releases roster MORE (R-W.Va.), considered the strongest GOP contender to run for retiring Sen. Jay RockefellerJohn (Jay) Davison RockefellerBottom Line World Health Day: It's time to fight preventable disease Lobbying World MORE's (D-W.Va.) seat.

In Kentucky, too, Democrats have yet to find a candidate to run against Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellThe Hill's Morning Report - Trump says no legislation until Dems end probes Threat of impeachment takes oxygen out of 2019 agenda Chances for disaster aid deal slip amid immigration fight MORE (R-Ky.).

According to numerous polls, McConnell is vulnerable heading into reelection. A handful of potential Democrats have turned down a run, however, and their top remaining recruit has yet to make a decision on the race, despite pressure from prominent local Democrats.

Hougesen noted the decisions of former Rep. Stephanie Herseth Sandlin (D) in South Dakota and Rep. John BarrowJohn Jenkins BarrowRepublican wins Georgia secretary of state runoff to replace Kemp The most important runoff election is one you probably never heard of Our democracy can’t afford to cut legal aid services from the budget MORE (D) in Georgia not to run as the "two biggest recruiting failures of the cycle," and said the GOP is simply taking its time in finding the best candidates.

—This post was updated at 2:06 p.m. and 4:28 p.m.