The first, and the most dangerous threat to Obama’s re-election, is a critical mass of voters saying this: “Barack Obama, nice man, good father, great that we finally elected an African-American. He tried hard. But you know what? I just want to try something new, even if I don’t know it will work.”

That sentiment is deadly for Obama. As long as Romney didn’t seem like a credible alternative, Obama kept it at bay, even though the economy has stagnated. But Romney reawakened that mood by the confident and crisp way he talked about the mechanics of how jobs are created — through start-ups, small businesses and entrepreneurship — and the catalytic power of markets. His presentation crackled with a freshness and a sense of possibility that was completely missing in Obama’s monotone discussion of health care, deficits and government programs. And where Obama had a chance to talk about how his own green jobs initiative has actually spurred all kinds of innovations and start-ups, he whiffed. (As some have noted, it is too bad the debate rules didn’t allow him to phone a friend.)…

The other Obama weakness exploited by Romney was the country’s political paralysis. Obama is right — most of that gridlock was orchestrated by the Republicans to make him fail. But the fact is, a lot of Americans today look at our politicians and feel as though we’re the children of permanently divorcing parents — and they are sick of it. There is a longing to see our politicians working together again. So when Romney spoke about how he met with Democrats once a week as Massachusetts governor to get stuff done, that surely touched a hopeful chord with some voters. Obama needs to stress that he, from his side, aspires to restore bipartisanship and has a plan to overcome paralysis and pull the country together in a second term.