How and why we did this swing-state poll.

The Times/Siena College battleground polls released on Sunday and Monday were conducted over the past week in six swing states that are likely to decide the election: Arizona, Georgia, Michigan, Nevada, Pennsylvania and Wisconsin. Five of the states were won by Donald J. Trump in 2016 and then flipped by Joseph R. Biden Jr. in 2020. Nevada, which has always been a close state, came down to less than one percentage point in the 2022 U.S. Senate election.

These states also contain some of the coalitions that will be crucial next fall: younger, more diverse voters in states like Arizona, Georgia and Nevada; and white working-class voters in Michigan, Pennsylvania and Wisconsin who helped swing the election to Trump in 2016, and were central to Mr. Biden’s 2020 victory. They also provide some geographic diversity.

We interviewed 600 respondents in each state to ensure we had a large enough sample to speak to specific subgroups of voters within these states, including age, race and ethnicity, income, education level, and party affiliation. Taken together, these 3,600 respondents represent our largest sample size of swing state voters to date. This also includes more than 700 undecided voters, a group that will be even more consequential within these crucial states.

This is not the first time we have focused on swing states this early in an election cycle. In 2019, the poll explored a similar set of states, reflecting the battleground at the time. The political moment was slightly different, with Democrats in the thick of a nominating contest that split the party between liberals like Senators Bernie Sanders and Elizabeth Warren and a moderate in Mr. Biden — and Mr. Trump was the incumbent president to beat.

However, the goals of that poll were similar to this one. As Americans in key states across the political spectrum weigh their options, these polls shed light on the issues driving the election and voters’ appetites for the leading candidates.