Senate Republican leaders on Monday will fundraise for state Treasurer Josh Mandel’s bid against Sen. Sherrod Brown (D).

Minority Leader Mitch McConnell (Ky.), Minority Whip Jon Kyl (Ariz.), Conference Chairman John Thune (S.D.), Policy Committee Chairman John Barrasso (Wyo.) and 26 other GOP Senators will headline the fundraiser, according to the invitation for the evening event.

Polling shows Brown leading Mandel, but both sides expect a competitive contest this November.

Roll Call rates this race as Leans Democratic.