The Campaign for Primary Accountability, a super PAC that's raised $2.5 million and has been active in about a dozen races across the country, maintains that long serving incumbents should be ousted because their campaigns are accountable to lobbyists, not district voters. Yet in one district, the challenger it's backing in Tuesday's Indiana primary is a former House member who went on to work as a registered lobbyist.

Recently, the super PAC helped oust Rep. Tim Holden, D-Pa., by calling him a friend to K Street. Part of the problem with incumbents, according the group's ...