WASHINGTON (AP) The Senate dealt a blow Friday to President Bush and his drive for a $1.6 trillion, 10-year tax cut, approving a budget that would shave $400 billion off his tax plan and spend billions more than he wants.By 65-35, the Senate approved a budget for next year that would open the way for a $1.2 trillion tax reduction. The vote came after White House officials and top Republicans abruptly abandoned days of intense efforts to pump up the size of the tax reduction, the keystone of the new administration