WASHINGTON (Reuters) - Democratic Sen. John Kerry said on Wednesday he was sorry about a "botched joke" that drew election-year fire from President George W. Bush and other Republicans who accused him of insulting U.S. troops in Iraq. Kerry reiterated the target of his joke was Bush, who immediately seized on the senator's remarks to rally Republican supporters ahead of Tuesday's elections, in which the party's control of Congress is at risk. Kerry said he was returning to Washington from a trip campaigning on behalf of Democratic congressional candidates because he did not want to be "a distraction." A day...