WASHINGTON — Democrats on the Senate Judiciary Committee voted Thursday to authorize subpoenas for two prominent conservatives who arranged luxury travel and other benefits for Supreme Court justices, but Republicans planned to object to the legitimacy of the action.The committee chairman, Sen. Dick Durbin, D-Ill., pushed through the vote in the meeting’s final moments after Republicans had walked out. The vote from the 11 Democrats would authorize subpoenas for Republican megadonor Harlan Crow and conservative …