First...what's your theory....that childlike behavior is a winning strategy?
My theory was that despite Biden's 19-point win in the eyes of undecideds, no conservatives here would say Biden won, and few would even call it a tie. RickWa proved my theory wrong... whether because he knew what I was up to or because he's just being honest, I don't know. I'd love to see a bigger sample size to check my theory more meaningfully, though. If we polled 1000 Democrats and 1000 Republicans about who won each of the two debates, I think we'd find a whole lot of variation in the opinions of the Democrats, and very little in the opinions of the Republicans. I think Republicans are just less honest, as a group. And I also think they just have more of a reluctance to criticize their own side.
You can see that latter point in other contexts. For example, how often do you hear Republicans being critical of America's actions abroad? There's very little Republican dissent of that sort. They regard America as their team, in the context of foreign policy, and their team can do no wrong. Democrats, obviously, are much more likely to criticize their own country's actions abroad. And I think that same mindset exists in the partisan sphere. Republicans almost never criticize their own team's leaders, even to the extent of panning a debate performance, while Democrats are much more likely to criticize their team's leaders. Read the tweets of Democrats and liberals during the Obama debate, and you'll find lots of criticism directed at Obama's performance, interspersed with the criticism of the moderator and of Romney's lying. Read the tweets of the Republicans and conservatives during the Ryan debate, and you see almost lock-step support of "their guy." It's just a different mindset.
If I'm right and that trend exists, then it would explain the big gap between a poll of all viewers giving Ryan a 4-point win and a poll of undecideds giving Biden a 19-point win. If the committed Romney voters in the former response group were almost universally saying Ryan won, while the committed Obama viewers were indulging in their usual honesty and willingness to second-guess their own leaders, Ryan would have had a big advantage in a poll that mostly consisted of partisans for the two sides.