Rudy never endorsed Clinton. In fact, Rudy was the US Attorney involved in prosecuting Mark Rich and demanded an investigation when Clinton pardoned Rich.
From the NY Times:
Mayor Rudolph W Giuliani cancels meeting with Senator Hillary Rodham Clinton, saying her husband's pardon of Marc Rich, commodities broker charged with tax evation and trading oil with Iran, would be distraction; Giuliani brought case against Rich when he was US attorney in New York and is now calling for congressional investigation into pardon
http://select.nytimes.com/gst/abstract.html?res=F30A1EFB3F5B0C758EDDA80894D9404482&n=Top%2fReference%2fTimes%20Topics%2fPeople%2fR%2fRich%2c%20Marc
I know. I just wanted to point out that Delphinium was bearing false witness.