Bain Capital, the private equity firm that Mitt Romney has touted as the source of his business acumen and one of his opponents for the Republican nomination has labeled "vultures" is the largest source of political money for the former Massachusetts governor over the course of his career.

Current and former executives and family members of Bain Capital have contributed more than $2.7 million to Romney's federal and state campaigns, federal and state leadership PACs, the Restore Our Future super PAC that supports Romney, and his gubernatorial inauguration fundraising committee.

Sunlight analyzed federal campaign finance data from the ...