The online poll shows Clinton with 48.1 percent to Trump's 45.9 percent.
Tuesday's data reflect a 1.3 percentage point shift toward Trump from data collected a day earlier and a shift of 1.7 percentage points toward him over the course of seven days, the poll's full sample size.
The Trump rebound has largely happened over the past three days, when he stopped what had been a 10-day free fall in the poll, initially stabilizing his numbers and then gaining to put the race back about where it was before the conventions, albeit with far fewer undecided and third-party voters left to win over.
The UPI/CVoter online tracking poll surveys about 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 Aug. 3 to Tuesday, when 1,452 registered voters were surveyed. Of them, 1,002 identified themselves as likely voters.