The two regions have four Biden-won states that will be key in 2024KEY POINTS FROM THIS ARTICLE— Both the Midwest and Interior West have states that Joe Biden carried by less than his popular vote margin in 2020.— In the Midwest, Michigan and Wisconsin will likely be prime battlegrounds states next year, although Michigan seems a harder lift for Republicans.— In the Interior West, Arizona’s Republican lean has been eroding in elections since 2008 — this allowed Biden to carry it in 2020, but Democrats will also have to work to keep neighboring Nevada in their column.