I expect Biden to come out in attack dog mode. He'll come out swinging for the fences, will sling dirt and will eventually spittle all over himself and say something stupid.
I think Paul Ryan is a seasoned enough politician to counter-punch most of Biden's blabber and by the end of the night will tie a knot in Biden's ass. I also think he'll come out aggressive.
Romney needed to be seen as likable and in-tune with America. Ryan will do some of the dirty work tonight.
"Silence is Golden. Duct Tape is silver"