Because the only difference between a RINO like Giuliani and a demoRat like Hillary is the letter R beside Rudy's name.
I don't assume that everyone who is on Free Republic is a conservative republican. I have watched the various polls conducted by Jim Robinson, and I think that there are mostly conservatives on Free Republic. However, there are some libertarian, some rinos, and some hit-and-run democrats.....and, of course, the occasional trolls.
Therefore, it wouldn't surprise me to find ~liberals on this thread, too.