WASHINGTON - Even though he's not running for re-election this year, President Bush knows just what he would focus on if he were: the economy and taxes. As Republicans face an increasingly tough political outlook, in part because of Bush's sagging approval ratings, the president offered some advice Monday to GOP candidates in the midterm elections. "If I were a candidate ... I'd say, 'Look at what the economy has done. It's strong. We've created a lot of jobs. ... I'd be telling people that the Democrats will raise your taxes. That's what they said. I'd be reminding people that...