A year ago, President Donald Trump won the White House promising to fix the economy. On Tuesday, Republican losses delivered a reminder of the high political price that the party in power pays when voters are still feeling squeezed. Trump himself was not on the ballot, and he never held rallies in either of the states where new governors were elected Tuesday. But the president was still a central character in the campaigns, a mainstay of the Democrats' advertising and their arguments on the stump.