Washington -- The Republican national chairman said Friday that his party's campaign to keep control of the House in the November midterm elections will focus on what he called the dangers to America if San Francisco's Democratic Rep. Nancy Pelosi becomes speaker of the House. It's a strategy Republicans already are deploying across the country in some of the hardest-fought contests. But analysts, pointing toward the political problems President Bush has created for his party, question whether the tactic will work. A Democratic-controlled House led by Pelosi, derided by Republicans as a "San Francisco liberal'' since she was elected House...