Conversation so far:
Did Rudy Giuliani hold a political position when he was running for senate in 2000?
Rudy Giuliani was mayor at the time he began his 2000 Senate campaign.
Was Rudy Giuliani still mayor when he was running for Senate in the 2000 campaign?
Rudy Giuliani was mayor at the time he began his 2000 Senate campaign.

Question: Who was his Democrat opponent for this race?
Self-contained rewrite: Who was Rudy Giuliani's Democratic opponent for the 2000 race for Senate?