GOP Builds Fund-Raising Advantage By SHARON THEIMER Associated Press Writer AP/Pablo Martinez Monsivais [20K] -------------------------------------------------------------------------------- WASHINGTON (AP) — President Bush raised at least $8 million Wednesday night for Republican Senate candidates, adding to a GOP fund-raising lead that has left Senate Democrats at a 2-to-1 cash disadvantage heading into the final month before the election. The Republican reserves — roughly $34 million for the Senate GOP committee and $42 million for the Republican National Committee as September began — will let the party pump money into last-minute get-the-vote drives and advertising campaigns in tight races that could decide control of...