"Mitch McConnellMitch McConnellProgressive group changes tone on Kaine Trump hits Kaine on TPP: He supports a 'job killer' Clinton maps out first 100 days 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 JohnsonThe Trail 2016: Putting the past behind them GOP groups scale back support for Sen. Johnson GOP works to unify around Trump MORE (R-Okla.), Rand PaulRand PaulWhat to watch for on Day 2 at the GOP convention Cyber squatters sitting on valuable VP web addresses Majority of GOP senators to attend Trump convention MORE (R-Ky.) and Mike LeeMike LeeObama signs opioid bill Thiel said to explain support for Trump in convention speech Convention erupts at Cruz snub 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.