Something made up by religious extremists trying to justify overturning Roe v Wade and taking away the rights of gay Americans to go about their daily lives just because Bush won the election by the smallest of margins. Even if Bush lost the popular vote and won, they'd say he still has a moral mandate. In fact, less than fifteen percent of all Americans were values voters, and mostly come from the South, which votes values most of the time anyway.
Bush has no mandate. About half the country voted him down. To get a mandate, you need to win in a landslide.