A Democratic group is hitting Sen. Mitch McConnellAddison (Mitch) Mitchell McConnellLawmakers feel pressure on guns Bipartisan group of House lawmakers urge action on Export-Import Bank nominees Curbelo Dem rival lashes out over immigration failure MORE (R-Ky.) and Rep. John Boehner (R-Ohio) with new ads charging they support cuts to Social Security and Medicare.

The ads note that the shutdown cost billions, and add that "Mitch McConnell and the Tea Party in Washington are demanding painful cuts to Social Security and Medicare."

"That may be Mitch McConnell's plan; tell him it's not yours," the ad urges viewers.

Republicans have proposed entitlement reforms — some of which have been endorsed by President Obama — as part of a budget deal to offset sequestration cuts.

Ads are running across Kentucky focused on McConnell, and in Boehner's district.

The group has joined up with Senate Majority PAC to launch a protracted campaign targeting the Senate Minority Leader, who is considered by Democrats one of the most vulnerable Republican incumbents this cycle.

And he's received a barrage of attacks from both the left and the right, with a conservative group on Tuesday launching an ad focused on McConnell's failure to defund ObamaCare and his role in ending the shutdown.

--This piece was corrected to reflect Republicans' proposals on entitlement reform.