In the same way that a Republican President would never have been able to get NAFTA through, as the Dems would have rallied around labor to defeat it. I believe that a RINO is *the* most dangerous animal to have in the White House because the Republican Party will fail to rally to stop things like a new Assaut Weapon Ban, (which is a sure thing to be proposed by both Hillary and Rudy, in my opinion), more socialized health care, illegal amnesty, etc.
A Democrat supporting this will be treated the way Clinton was by Newt's house (if the R's are in control). Or the way Bush has been by the Senate Dems (where they are minority). A Republican proposing the exact same legislation will not get push back from majority of his own party, and thus the bad programs have a better chance of passing.
Tactically I would consider voting for Hill over Rudy for this reason.