With a vote set for high noon on Tuesday, the political tide in the Senate has shifted to now favor the White House and Pentagon in their pivotal fight to strike new procurement funds for the F-22 fighter. Just last week, conventional wisdom held that the $1.75 billion authorization would easily survive a challenge on the floor. But fearful of embarrassing President Barack Obama, Democrats appear to be moving back toward the White House, which has mounted its own late-breaking campaign to win the last votes.