WASHINGTON - Republicans moved Tuesday to seek Rep. William J. Jefferson's expulsion from the House, a day after the Louisiana Democrat was indicted on charges of receiving more than $500,000 in bribes. Jefferson, meanwhile, relinquished his seat on the House Small Business Committee before members of his own party could vote to kick him off the panel. In a two-paragraph letter to Speaker Nancy Pelosi (news, bio, voting record), Jefferson, 60, said he was taking the step "in the light of recent developments in a legal matter." Republicans, citing Pelosi's election-season promise to run the most ethical House in history,...