From Wikipedia:
"As President of the Senate, he has cast seven tie-breaking votes to date, including deciding votes on concurring in the conference reports of the 2004 congressional budget and the Jobs and Growth Tax Relief Reconciliation Act of 2003."
Great, thanks.
I was sort of expecting the number to be higher than seven. Especially since for the first few months of his term, the Senate partisan composition was exactly 50-50.
Yeah, it's a little surprising. When you look through the legislative history, a very large percentage of bills in both the House and Senate were actually passed by overwhelming margins. The close votes are actually very rare.