A Post-Primary Rally Boosts Trump, Albeit with Challenges Aplenty (POLL) By GARY LANGER May 22, 2016, 12:00 AM ET Getty Images Bernie Sanders at a presidential primary debate, April 14, 2016, in New York. Hillary Clinton at a campaign rally, April 17, 2016, in Staten Island, New York. Donald Trump speaks at a fundraiser, April 17, 2016. in Staten Island, New York.more + 607SHARES Email A new ABC News/Washington Post poll shows a close contest in presidential election preferences, with Republicans lining up behind Donald Trump as their party’s presumptive nominee while the continued Democratic race is keeping Hillary Clinton’s side more unsettled. Greater voter registration among Republicans is one factor: Clinton’s 6-point lead among all adults, 48-42 percent in a general election matchup, switches to essentially a dead heat among registered voters, 46 percent for Trump, 44 percent for Clinton. Regardless, the contest has tightened considerably since March, when Clinton led among registered voters by 9 points. See PDF with full results here.