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 Gardner The 13 Republicans needed to pass gun-control legislation Bolton returns to political group after exiting administration The Hill's Morning Report — Trump's hurricane forecast controversy won't go away MORE (R) opted against challenging 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), 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 BennetDemocrats seize Senate floor to protest gun inaction: 'Put up or shut up' Gabbard drives coverage in push to qualify for October debate Bennet launches first TV ads in Iowa MORE (D) when he's up in 2016.

North Carolina Labor Commissioner Cherie Berry (R) decided not to run for Sen. Kay HaganKay Ruthven HaganTillis trails Democratic challenger by 7 points in North Carolina poll North Carolina businessman will challenge Tillis in GOP primary Embattled senators fill coffers ahead of 2020 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 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 (D) for retiring Sen. Tom HarkinThomas (Tom) Richard HarkinWisconsin lawmaker gets buzz-cut after vowing not to cut hair until sign language bill passed Democratic debates kick off Iowa summer sprint Key endorsements: A who's who in early states 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 MurkowskiKavanaugh impeachment push hits Capitol buzz saw McConnell lashes out at Democrats over 'unhinged' criticism of Kavanaugh The 13 Republicans needed to pass gun-control legislation 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 BegichAlaska political mess has legislators divided over meeting place Former GOP chairman Royce joins lobbying shop Lobbying world 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 CapitoThis week: House jump-starts effort to prevent shutdown Congress set to ignore Trump's wall request in stopgap measure America is in desperate need of infrastructure investment: Senate highway bill a step in the right direction 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 McConnellDemocrats seize Senate floor to protest gun inaction: 'Put up or shut up' Democrats press for action on election security Hillicon Valley: Election security looms over funding talks | Antitrust enforcers in turf war | Facebook details new oversight board | Apple fights EU tax bill 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.