"Mitch McConnellMitch McConnellMcConnell: Trump needs to act like a 'serious candidate' Overnight Finance: Wall Street awaits Brexit result | Clinton touts biz support | New threat to Puerto Rico bill? | Dodd, Frank hit back The Trail 2016: Berning embers 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 JohnsonMcConnell quashes Senate effort on guns Bipartisan gun measure survives test vote Senate to vote on two gun bills MORE (R-Okla.), Rand PaulRand PaulRepublicans question Trump's trip to Scotland Hate TV customer service? So does your senator Overnight Cybersecurity: Senate narrowly rejects expanding FBI surveillance powers MORE (R-Ky.) and Mike LeeMike LeeNo reason why women shouldn't be drafted Overnight Cybersecurity: Senate narrowly rejects expanding FBI surveillance powers Anxious Washington watches Brexit vote 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.