A super PAC supporting Senate Minority Leader Mitch McConnell (R-Ky.) unveiled a new TV ad Tuesday that goes after Secretary of State Alison Lundergan Grimes (D), a potential McConnell challenger.

The group casts Grimes as a rubber stamp for President Obama and Senate Majority Leader Harry Reid (D-Nev.). "Reid's having secret meetings with Alison Grimes because she's Obama's cheerleader in Kentucky," says the narrator of the spot, released by Kentuckians for Strong Leadership. The ad cites a report about Reid meeting with Grimes. It also defends McConnell against Democratic jabs.

The new commercial comes days after two Democratic groups launched a TV ad campaign, with at least $250,000 behind it, hitting McConnell. The organizations announced Tuesday they would continue to go after McConnell with a new round of online ads.

Democrats are hoping Grimes will challenge McConnell. But she has other options, too, including running for governor or attorney general. "Right now, I am continuing to do that due diligence, continuing to gather the facts," Grimes told WHAS-TV of Louisville.

The pro-McConnell group said it is spending $260,000 to run its ad in the Lexington, Louisville and Paducah media markets on both broadcast and cable.