http://www.senate.gov/legislative/LIS/roll_call_lists/roll_call_vote_cfm.cfm?congress=105
Santorum voted to confirm Sonja Sotomayer..heck, even McCain voted NAY.
Your link shows nothing...but it doesn’t matter. Santorum could NOT have voted to confirm Sotomayer. His last day in the Senate was January 3rd, 2007.