It's actually theorized that Bush being ultimately elected was what caused 9/11 to slip past the usual degree of scrutiny already in place.

The delay in beginning the transition process from Bush suing over the recounts meant that the usual reports on the plans that had been uncovered weren't delivered until whoever had gotten them would be having to prioritize what to look at, and Bush is not famous for his ability to prioritize well.

Had Gore Won, there's a non zero chance he could have been riding into the midterm election cycle on having stopped what would have been the most catastrophic attack on America since Pearl Harbor.