He makes twenty million a year giving speeches. You think he really wants to give that up to become mayor so he can cut city services to keep the city alive and then have all the libs hating him for cutting their services or raising their taxes/fees.
He might want to do it, so he can more safely secure the state for his wife in her presidential run and before that, re-election. She's the senator, but with the right competetion, she could get booted.