Two quotes from this fascinating article that really work for me:

This whole thing about “zingers,” I never even heard that word discussed in debate prep,” Stevens says. ‘If you go back to the history and look at Governor Romney’s 20 debates, he likes policy, he likes substance, and he likes strong arguments that are based on merits and on differences. He’s never been one for debate tricks and sleight of hand.’

And how different from Obama is this, and these are the characteristics you want in a President:

The friend says Romney didn’t think of the debate as a political dialogue but as a grueling, 90-minute competition that demanded discipline. He prepared in the same way he used to review pending business deals at Bain Capital: He challenged his closest advisers about the most minor points, he spent a lot of time reading, and he constantly bantered with his aides about the other side’s weaknesses and strengths.