This tool helps you look for the money behind the candidate. Here's how Ruth Marcus a columnist for The Washington Post puts it: The Center for Responsive Politics has made itself into an essential Washington - actually, make that an essential national - institution. Now more than ever, with the proliferation of super PACs and 501(c)(4) groups pouring huge sums into campaigns, it's critical to have a reliable and handy source of information on money and politics. Opensecrets.org is the go-to site for this data - trustworthy, accessible and well-presented.