CBS News' : (NASHVILLE, TENN.) - After most of the previous 12 months covering Barack Obama's campaign for the presidency, it was interesting, instructive and, well, relaxing to follow John McCain for the last few days. The differences between the two are striking. Obama is the big time orator, McCain is the guy who struggles with a teleprompter or even note cards strategically placed nearby. Obama's crowds are larger, more enthusiastic. McCain's events are smaller, but to my eye, better choreographed. And now with the addition of Sarah Palin to some of his events, McCain can boast of crowds that...