McConnell issued a statement Tuesday saying he was still undecided.
"Congress and our constituents would all benefit from knowing more about what it is he thinks needs to be done --- and can be accomplished --- in Syria and the region," the GOP leader said after a White House meeting with the president.
McConnell aides say his caution has nothing to do with the campaign.
But Bevin is on record opposing military strikes against Syria, as is Paul -- and to take a position at odds with his primary rival and new ally would instantly make the Syria debate a campaign flashpoint.
Democrats were already on record promising to make Leader McConnell a top 2014 target, even though Kentucky hasn't elected a Democrat to the Senate since Wendell Ford won his last six year term in 1992.
Secretary of State Alison Grimes is well aware of the history, and using her early months of the campaign to try to make the case she would be no rubber stamp for Obama.
"We have had trouble in our state identifying with the national Democratic Party," Grimes said in an interview. "I will tell you I am running as a Kentuckian. ... I have my disagreements with the president."
Chief among them, she says, is an energy policy she called anti-coal. Grimes also favors changes to the health care law, but says it has many admirable pieces that should be kept.
She is campaigning, at least for now, as someone who expects McConnell to survive the primary challenge.
"It's about ending the disease of dysfunction that we have seen in Washington, D.C.," she says of her campaign. "And after nearly 30 years, Senator McConnell is at the center of it. He is to blame for the failed leadership."
McConnell's team labels Grimes as too liberal for the state and suggests the president's standing here would be a major drag.
But the incumbent himself prefers not to deliver direct blows, just yet, leaving that, for the most part, to his team and TV ads.
"I like a good campaign," McConnell said after the fair breakfast. "We are going to have a lot of fun."