Ahmadinejad participated in the Hostage Crisis during the Carter Admin. Jimmy would probably meet him at ground zero and give him a big sloppy kiss.
Its great propaganda for him no matter the result. If he visits and is heckled, then its US hatred for Iran. If denied visit, then its US hatred for Iran. If he visits with a private guided tour -were sheep for the slaughter!!!
Not really. Accepting his request would have been perceived as sign of our weakness. The converse is also true.