Wall Street dips on election jitters, weak oil

U.S. stocks fell on Wednesday, with the S&P 500 headed for seventh day of losses as a tightening race for the White House rattled investors and a fall in oil also weighed on sentiment. Investors are rethinking their long-held bets of a Nov. 8 victory for Democrat Hillary Clinton amid signs that her Republican rival Donald Trump could be closing the gap. While Clinton held a 5 percentage point lead over Trump, according to a Reuters/Ipsos opinion poll released on Monday, some other polls show