If the chips fall right for Democrats and their party seizes control of the House, President Bush's agenda on Capitol Hill would fall into the hands of some of his most dogged opponents. It's not just would-be Speaker Nancy Pelosi of California, but a boatload of Democrats newly running committees who would determine what legislation gets debated and which programs and agencies get scrutiny. So who are the chairmen to be? a Polish-American lawyer with a reputation for making witnesses quiver. a die-hard liberal from New York's Harlem with 35 years in the House. a free-spending progressive from Wausau, Wis....