The Fact Checking websites, like Politifact and FactCheck,org, have
tried (unsuccessfully) to rip Paul Ryan's speech last night at the RNC
convention to shreds. This will likely happen tonight too when Romney
takes the stage.This isn't new though. A couple weeks ago, FactCheck.org took on a
Mitt Romney ad that said the “Obama administration has adopted a plan
to gut welfare reform by dropping work requirements."
FactCheck.org claimed that statement isn't true--by actually proving that it is.  Understand their claims, and you'll have the ammo to defeat them.