You're familiar with snopes.com, where you prove to your extended family that those ridculous emails they send you aren't true.
You can do the same with campaign 'facts' that come out in attack ads and debates. This site does put their spin on things, but you get a lot more information than you do from a sound bite. Click here for Factcheck.org
For all of you Republican McCain fans- here's a little story for you: Click here for McCain and Hillary are BFF