WASHINGTON - He can't just blame the Democrats. Some lawmakers in President Bush's own party are giving him an increasingly hard time over everything from Social Security to a free-trade pact for Central America to his plan to ease immigration laws. It may be an early lame-duck warning for his presidency. Bush returned from a celebratory trip to Europe to a domestic agenda badly in need of his quick attention. One of his chores is to shore up GOP support where possible. "The president stays in regular contact with members of Congress, congressional leaders, about how to move forward on...