WASHINGTON (Reuters) - Democratic presidential nominee Hillary Clinton held a four percentage point lead over Republican Donald Trump in the ABC News/Washington Post poll released on Monday, one day before the U.S. presidential election. In a survey of 1,763 likely U.S. voters, 47 percent said they backed Clinton and 43 percent said they supported Trump. The poll has a margin of error of plus or minus 2.5 percentage points, according to the Washington Post.  A separate Bloomberg Politics-Selzer & Co poll released earlier on Monday showed Clinton with a 3 point lead. 