WASHINGTON (CBS.MW) -- President Bush has regularly counted on Democratic Sen. Zell Miller to buck his party and back the White House's tax-cutting efforts. On Wednesday, the Georgia politician officially endorsed Bush's re-election bid, excoriating Democratic presidential contender John Kerry's tax proposals. Miller, in remarks prepared for delivery at a rally, said he would remain a Democrat "until the day I leave this earth." But had harsh words for Kerry and the national Democratic Party. Miller said the Bush tax cuts have helped boost the economy and said that job creation is beginning to pick up steam. "These are good...