Millions of voters have already cast ballot for Nov 5 election

Early in-person and mail-in ballots have begun pouring in across the country, and the tally in each state reveals mounting voter enthusiasm. 

Recent polling suggests a razor-thin margin in the race between former President Donald Trump and Vice President Kamala Harris, and the results are expected to come down to each candidate's performance in seven swing states: Pennsylvania, Georgia, Arizona, Michigan, Wisconsin, Nevada and North Carolina. 

States have long allowed at least some Americans to vote early, like members of the military and people with illnesses unable to get to the polls. Many states expanded eligibility in 2020 during the COVID-19 pandemic.

WHAT ARE ELECTION BETTING ODDS? EXPERT EXPLAINS WHY TRUMP IS CURRENT FAVORITE

In the last presidential election, mail ballots tended to skew Democratic. In 2020, 60% of Democrats reported voting by mail, compared to 32% of Republicans, according to a 2021 study from the MIT Election Data and Science Lab.

As of Tuesday afternoon, more than 15 million ballots have been cast nationwide.

Here is a breakdown of where early ballots have been cast, either by mail or in person, in the seven battleground states, according to The Associated Press.