The United States will hold presidential elections on November 3rd.

Early voting has already begun in some states.

Swing states 32 main candidates Republican President Donald Trump and former Democratic vice president Joe Biden are campaigning mostly in swing states.

In this year's presidential election.

There are up to eight swing states.

A swing state is a state where presidential candidates from the two main parties share similar levels of support among voters.

Political observers believe that voters in swing states have the most power to affect the result of elections.