The online poll shows Trump with 47.93 percent to Clinton's 47.05 percent.
The most recent data reflect a significant one-day shift for Clinton, who ticked up 1.33 percentage points in one day, while Trump lost nearly 1 percent.
The UPI/CVoter online tracking poll surveys at least 200 people each day, leading to a sample size of roughly 1,400 people during any seven-day span.
Because the poll is conducted online and individuals self-select to participate, a margin of error cannot be calculated. The poll has a credibility interval of 3 percentage points. This seven-day span includes data collected from Sept. 7 to 13, when 1,811 individuals were surveyed. Of them, 1,245 identified themselves as likely voters.