The online poll shows Clinton with 48.34 percent support to Trump's 47.87 percent and 3.79 listing as other -- respondents who declined to pick either candidate. The poll was conducted for seven days through Saturday, one day after FBI Director James Comey announced a review of additional emails in connection with Clinton's use of a private email server while she was secretary of state.
One day earlier, Clinton led by 2.14 percentage points -- 49.25 vs. 47.11 and 3.64 "other."
In polling conducted before the announcement, through Thursday, Clinton's lead was 1.38 percentage points.
Clinton's biggest lead was 6.59 percentage points through Oct. 15 after the release of a videotape from 2005 featuring Trump speaking crudely about women.
The UPI/CVoter online tracking poll surveys at least 200 people each day, leading to a sample size of more than 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 Oct. 23 to 29, when 1,892 individuals were surveyed. Of them, 1,317 identified themselves as likely voters.