"Rudy is weak on borders; so therefore, would be weak on fighting terrorism."
There may be some truth in what you say, but it's highly debateable. While he does have some identifiable weaknesses (to Conservatives), he has one undeniable and striking strength - he has great charisma. That got Bubba elected, it can get Rudi elected. He'll be a great campaigner.
He would stand a great chance of taking New York which Republicans typically lose.
"..he has great charisma.."
That's what I'm worried about. Some Republicans like Rudy because of his charisma.
Besides being a liberal in just about every way, Rudy will NOT be strong on TERRORISM, because of his pro-ILLEGAL immigration stance:
"....But, as Michelle Malkin has revealed, under Giuliani, New York was an illegal alien sanctuary and "America's Mayor" actually sued the federal government in an effort to keep New York City employees from having to cooperate with the INS...."
http://www.humanevents.com/article.php?id=16762
If you run a liberal against a liberal, you will end up with a liberal.