Among all likely voters, 56 percent are anxious about Clinton becoming president while 61 percent are anxious about Trump. While anxiety for Trump is slightly higher than for Clinton, the five-point gap has shrunk from a 15-point difference August when 67 percent were anxious about Trump’s presidency following the Democratic National Convention and a high-profile dispute with a Muslim Gold Star father. Then, 52 percent of likely voters said a Clinton presidency made them anxious…

The Post-ABC Tracking poll finds 57 percent of registered voters are following the election “very closely” and 85 percent say they’re absolutely certain to vote or have already cast ballots. Both measures are similar to four years ago, and nearly identical percentages of Clinton and Trump supporters are reporting high attention to the race.

The poll underscores how widespread concerns about Clinton make it difficult for her to expand beyond a single-digit edge over Trump, as well as Trump’s continuing challenges in appealing beyond a core base of supporters.

Clinton inspires anxiety among at least half of voters in a variety of swing voting groups, as well as some who lean Democratic, including 67 percent of independents, 56 percent of Catholics, 52 percent of women, 53 percent of voters under age 40 and 55 percent of moderates. Uneasiness about a Trump presidency is higher among all of these groups except independents, though not always by wide margins.