If you have the time and the inclination then www.factcheck.org is a great place to see the lies, half truths and mistaken claims made.

The issue is that it is a reflex for a politician to lie so you need a lot of time to figure out the deceptions.

http://www.factcheck.org/2004/06/false-ads-there-oughta-be-a-law-or-maybe-not/