The Republican Main Street Partnership political action committee, which promotes political centrism in the GOP, last month donated to four House candidates running in Democratic-held districts — three of whom face serious primary opposition.

RMSP PAC is wading into the GOP primary in Illinois’ 14th district, where Rep. Bill Foster (D) is seeking a second full term. It donated $2,000 to Ethan Hastert, who faces state Sen. Randy Hultgren in the Feb. 2 primary. Hastert is an attorney and son of former Speaker Dennis Hastert (R-Ill.).

The PAC gave $5,000 to Ohio businessman Jim Renacci, a former small-town mayor who is challenging freshman Rep. John Boccieri (D) in the Canton-area 16th district. National Republican party figures prefer Renacci over Matt Miller, a former county commissioner who ran competitively in the 2006 and 2008 GOP primaries.

The PAC gave $5,000 to ex-Rep. Charlie Bass (N.H.), who served in the House from 1995 through 2006. Bass is exploring a campaign to win back his old 2nd district seat, and he would face a primary against 2008 nominee Jennifer Horn and former state Rep. Bob Giuda and possibly others.

Steve Stivers, a former Ohio state Senator, received $2,000 for his rematch campaign against freshman Rep. Mary Jo Kilroy (D), who narrowly beat Stivers last year in the Columbus-area 15th district.

The contributions were disclosed in an electronic filing that RMSP PAC made Saturday to the Federal Election Commission.