Bush had majority support on two days (aside from the reaction to 9/11). Those two days were Election Day 2000 and Election Day 2004. His focus was on having enough support on those two days to win the election.
Compare that to Bill Clinton and Barack Obama, who were obsessed with their poll numbers every day of their respective administrations. They were constantly struggling to win the news cycle, and the campaign never stopped.
.... um ....
... er ...
Let's ponder that a while, and maybe something will occur to us ...