Biden is coming across very unstatesman-like. He looks like a jackass. He's spluttering and stuttering and twitching and all over the map.
Ryan should have explained what he meant about having no daylight between US and Israel policy on Iran. Most voters won't even have noticed that Biden said he does not want Iran to have a nuclear weapon, while Ryan said he does not want Iran to have a nuclear weapon capability.
That one word is the daylight between the Obama Administration and Israel. And that daylight is what Iran is exploiting. Ryan was sending a very clear message that he and Romney's policy are aligned exactly with Israel's.
Biden kept going on about how Iran does not have a weapon to put a nuclear bomb in. You could drive a truck through that argument, but Ryan missed his chance.