I think an enduring mystery is why Rudy didn't put more effort into New Hampshire. After failing to catch on right away there he basically gave up, resigning himself to a string of defeats before he made his hapless Florida stand. Bad move.
Update: I'm looking over some old Rudy campaign schedules archived in my inbox and realizing it's a big overstatement to say he "gave up" on New Hampshire, where he campaigned hard after Christmas. But Rudy certainly didn't focus on NH like he could have. I might have more to add in a later item.
--Michael Crowley