Bottom line is, Andrew and Caroline notwithstanding, Rudy is electable and Hillary and Obama are not, especially if they continue to cannibalize each other's base.
However, if a surprise entry such as Al Gore were to enter the fray, the mix would be different and unpredictable. We would have to poll like crazy to determine the effect. Just IMHO...
I totally disagree.
Rudy will tear the party in two. There are many of us who will go third party. And there will be a conservative third party guy who will run just to counter Rudy.