I think the clip about Ronald Reagan is the most effective. It showcases what Reagan has achieved as President. Rather than making promises about what he will do or attacking the other candidate the ad simply talks about how the country has improved with him leading it. No, none of the ads really crossed any lines so to speak but the “Daisy” one did come pretty close by basically saying if you voted for Goldwater then the world will die in nuclear fire, however it was a different time. As for negative ads, they can, if not executed correctly cause a backlash that can hurt the other candidate. The one with Obama attacking Romney is an example of a well done attack ad because it is only stating facts that were reported by well respected newspapers.