San Francisco Chronicle: For weeks, pressure has been mounting in Congress to approve more domestic oil drilling, but House Speaker Nancy Pelosi has held the line, using her power to block a vote on offshore drilling. President Bush has made almost daily calls for Democratic leaders to take action. House GOP leaders, citing a new poll showing that a slim majority of Californians now favor offshore drilling, issued a release Thursday saying “even (Pelosi’s) own California neighbors oppose her efforts to …