[LdSentinal]

However, I don't see how that proves that Rudy Giuliani convinced one voter, living in any part of the country, to vote for his chosen candidate for public office.

No? How do you think Michael Bloomberg became mayor of NYC when he was down by double-digits with twelve days to go to election day back in 2001.

[Do not dub me shapka broham]

The thrust of your argument revolves around the actions Mayor Giuliani took in the wake of September 11, 2001.

Yes, he did ably fulfill his role, and I am glad that we weren't forced to endure the leadership of Mark Green at the particular historical moment.

Putting that aside, I don't see how this makes him indispensable to the future of the Republican Party.

Granted, his positions on foreign policy/national security are probably the most desirable part of any purely theoretical Giuliani candidacy, but that presumes that any prospective opponent would be worse on these issues, which has yet to be established, in my estimation.