A conservative outside group is endorsing against yet another Senate GOP incumbent.

The Senate Conservatives Fund announced Tuesday that it is endorsing physician Milton Wolf over Sen. Pat Roberts (R-Kan.).

"Kansas Republicans deserve a real choice this election, and Dr. Wolf gives them a chance to send someone new to Washington who will shake things up and bring about real change," SCF executive director Matt Hoskins said in a statement.

Wolf is one of seven challengers to the 12 incumbent GOP senators seeking reelection. He also just happens to be a distant cousin of President Obama.

Roberts has one of the more conservative records among Senate Republicans. He has the fifth highest rating on the Heritage Action scorecard and even voted against the Troubled Asset Relief Program (TARP) bailout.

SCF is also backing challengers to Senate Minority Leader Mitch McConnell (R-Ky.) and Sen. Thad Cochran (R-Miss.), and it said Monday night that it is looking at potentially endorsing Rep. Steve Stockman's (R-Tex.) just-launched bid against Senate Minority Whip John Cornyn (R-Tex.).

Aaron Blake covers national politics and writes regularly for The Fix.