You are right! We were attacked many times before Bush ever ran for office. First attack on WTC was 1993. Good point you made!
I suspect that we WOULD see another major attack if Kerry is elected. Both Presidents' Clinton and Bush43 were less than a year into their administrations when the WTC was bombed both times.
Best opportunity for them to strike is during the changing of the guard.
John Kerry would still blame the previous administration for "not making America safer". If we compare international attacks on US interests 2001-2004 to 1997-2001, we will see that we were safer (in the post 9-11 time frame when all of America realized that yes we had let this threat go on too long).