Biden won Arizona and Georgia in 2020 by a nose. Here's why that'll be hard to do next year.

• Joe Biden's 2020 victories in Arizona and Georgia were major triumphs for the Democratic Party.
• Biden ran up his margins in large metro areas and among the party's Black and Latino base voters.
• But Biden is currently struggling with voters on a range of issues in these crucial swing states.

In the 2020 election, Joe Biden's victories in Arizona and Georgia were two of the most significant presidential triumphs for Democrats in recent decades, as the party finally broke through with voters in a major way in what had long been Republican strongholds.

But the wins were narrow.