Democrat Hillary Clinton and Republican Donald Trump crisscrossed the country on Monday as they raced to sway undecided voters in a tight US presidential race that has Clinton with a narrow lead according to opinion polls. With only one day left before Election Day, the Clinton campaign was boosted by Sunday's unexpected FBI announcement that it stood by its July decision not to press any criminal charges in an investigation of Clinton's email practices. A Fox News opinion poll on Monday had former Secretary of State Clinton leading Trump, a wealthy New York real estate developer, by four percentage points among likely voters. Major bookmakers and online exchanges were more confident than public opinion polling that Clinton will win Tuesday's election. Predictit put Clinton's chances of capturing the White House at 81 percent.