Rendell runs a massive GOTV operation -- it'll be pretty damn intense.
# of votes in PA: Gore 2000: 2,465,412 Rendell 2002: 1,898,214 Kerry 2004: 2,885,773
Let's put it in context by looking at another blue state, Illinois:
# of votes: Gore 2000: 2,588,884 Blagojevich 2002: 1,824,211 Kerry 2004: 2,866,307
Okay, actually, that's pretty close. Nevermind.
Basically, the gubernatorial campaign will handle all the GOTV for all statewide PA races in 2006, I'd imagine, because they're not subject to the same contribution limits.
The problem comes when one or more of the candidates decide to a Mutual Assured Destruction advertising budget.