The convention wisdom is (a) there will be fewer than the 68 million who watched the first debate and (b) the town hall format doesn't lend itself to the direct confrontation we saw in the first debate. I'm not sure I believe either.
Romney has the advantage of having proven he can compete with - and defeat - Obama in a head-to-head match-up. He doesn't have to repeat his overwhelming victory in Denver, but neither can he look like he's settling for a tie.
Romney has to demonstrate the same aura of confidence and competence he showed two weeks ago, without stretching over the line toward arrogance which would only feed The-Rich-Guy-Doesn't-Care-About-You story on which the Obamas have spent nearly a half billion dollars pushing. I'll have my post-game analysis immediately following the debate.