Rubio raises more than $200k for McConnell

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Rubio's help on the trail should boost McConnell's credibility with Tea Party voters in Kentucky, a group that's long been wary of McConnell's record in the Senate. Some Tea Party groups have been actively pursuing a primary challenger to McConnell, but no possible contenders have yet jumped into the race.

"Mitch McConnellMitch McConnell'Never Trump' plots its last stand Dems leery of Planned Parenthood cuts spark Senate scuffle Overnight Finance: Senate sends Puerto Rico bill to Obama | Treasury, lawmakers to meet on tax rules | Obama hits Trump on NAFTA | Fed approves most banks' capital plans MORE's quiet, principled leadership is key to everything we accomplish on Capitol Hill," Rubio said during the event, according to CNN.

"The way he fought ObamaCare, tooth and nail, and forced the Democrats to use extraordinary measures to pass it was a critical catalyst in electing my entire class of Senate conservatives in 2010. Without Mitch, I don't know that we'd have Senator Rubio, Senator Johnson, Senator Paul or Senator Lee."

Sens. Ron JohnsonRon JohnsonPollster: Clinton leads in 5 battlegrounds Juan Williams: GOP sounds the sirens over Trump Vulnerable Republican seeks edge on homeland security MORE (R-Okla.), Rand PaulRand PaulTrump: Rivals who don't back me shouldn't be allowed to run for office Trump hires Rand Paul's former digital director: report Trump flexes new digital muscle MORE (R-Ky.) and Mike LeeMike LeeMike Lee: Trump 'accused my best friend’s father of conspiring to kill JFK' Two transgender candidates win primaries Overnight Finance: Trump threatens NAFTA withdrawal | Senate poised for crucial Puerto Rico vote | Ryan calls for UK trade deal | Senate Dems block Zika funding deal MORE (R-Utah) all have Tea Party support, and affiliating himself with all three will likely help McConnell appeal to those skeptical voters on the right.

McConnell is likely to face a strong challenge from Democrats as well, who believe he is one of the nation's most vulnerable incumbents in 2014. Two Democratic contenders, actress Ashley Judd and Kentucky Secretary of State Alison Lundergan Grimes, have emerged as possible challengers.

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