Harris' lead over Trump might not be enough to win the election even if it holds through Nov 5.
National surveys, including Reuters/Ipsos polls, give important signals on the views of the electorate, but the state-by-state results of the Electoral College determine the winner, with seven battleground states likely to be decisive. Trump defeated Democrat Hillary Clinton in the 2016 election, triumphing in the Electoral College even though she won the national popular vote by 2 points.
Polls have shown Harris and Trump are neck and neck in those battleground states.
The poll gave signs that voters - particularly Democrats - might be more enthused about this year's election than they were ahead of the November 2020 presidential election when Democrat Joe Biden defeated Trump.
Some 79% of registered voters in the poll - including 87% of Democrats and 84% of Republicans - said they were "completely certain" they would cast a ballot in the presidential election. The share of sure-to-vote poll respondents was up from 74% in a Reuters/Ipsos survey conducted Oct. 23-27, 2020, when 74% of Democrats and 79% of Republicans said they were certain to cast ballots.
The new poll had a margin of error of 2 percentage points.
Harris entered the race in July after Biden ended his reelection effort following a poor debate performance against Trump in June. Trump at the time was widely seen as the frontrunner, partly based on his perceived strength on the economy after several years of high inflation under the Biden administration, which has eased in recent months.
Given the close match, the candidates' efforts to ensure that their supporters actually cast ballots will likely be key in determining the winner. Just two-thirds of U.S. adults voted in the November 2020 election, which was the highest turnout in over a century, according to estimates by the U.S. Census Bureau and the Pew Research Center.
Roughly one-third of registered voters are Democrats and one-third Republican, with the balance independents or those who favor third parties, according to an estimate by Pew Research.
The latest Reuters/Ipsos poll surveyed 4,129 U.S. adults online, nationwide, including 3,481 registered voters. Some 3,307 of the respondents were considered the most likely to turn out on Election Day. Among these likely voters, Harris held a 3-percentage-point lead over Trump, 48% to 45%.
Source: Reuters