Rep. John Yarmuth (D-Ky.) had a blunt assessment of the dynamics in next year's Kentucky Senate race Thursday night.

"I can be really brief tonight and just say, Mitch McConnell sucks," he told the crowd at a Jefferson County Democratic Party dinner.

At the same dinner, Kentucky Secretary of State Alison Lundergan Grimes appeared to be embracing the idea of a challenge to the Senate minority leader, although she has set no timetable for her decision and is still not a sure bet to run.

"So, my fellow Kentuckians, I ask you, based on tonight and the coming months, will we send a message that Kentucky is ready for new leadership in Washington, D.C.?" she asked the crowd.

"The liberals are coming completely unhinged," McConnell campaign manager Jesse Benton said in response to Yarmuth's comment, which he deemed "classless."

Polling has suggested that McConnell could be vulnerable, but he is a skilled politician with a huge war chest. Yarmuth has been pressuring Lundergan Grimes to either get in the race or bow out so other potential Democrats can step forward.

"I do think that it is important that Alison Grimes immediately decide whether she’s running or not because there are a number of people sitting on the sidelines who would be interested I think in making a race who are waiting to find out what she does," Yarmuth told the radio station WFPL last week. "And for her to keep prolonging this, as she said possibly until the late summer, I think is a disservice to the party."