The margin of victory between Hoeffel and Specter was almost the same number as Constitution party Jim Clymer's and much smaller LP candidate votes. IF Toomey had been selected, PA might have delivered for Bush. Instead Specter ran "Kerry and Specter for Working Families" lawn signs.
You are drunk if you think Toomey would have turned out 100,000 people that didn't vote.
Toomey on the ticket wouldn't have driven out 5,000 more people who were going to vote.
PA was a battleground state. Less than 100 Republicans
(if any at all) stayed home because Toomey got stiffed back in April.