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

RMSP PAC is wading into the Republican primary in Illinois’ 14th district, where Rep. Bill Foster (D) is seeking a second full term. It donated $2,000 to Ethan Hastert, a lawyer and son of former House Speaker J. Dennis Hastert who is running against state Sen. Randy Hultgren in the Feb. 2 primary.

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.