This map shows states where Republican governors are term-limited and will have open elections in 2018. Dark states are states with Republican incumbents that voted for Hillary Clinton. It seems pretty inevitable that Democrats will pick up a couple seats, especially considering that the party in opposition usually has some solid gains in midterms.
You for got Ducey in AZ. He's not term-limited but AZ has a history of electing governors from the opposite party. It will be difficult as we have no statewide Dems right know but Greg Stanton, the mayor of Phoenix could possibly mount a challenge. It will probably depend on the prevailing mood. Napolitano won AZ in '02 by 12,000 in a very Republican midterm with a very popular President so anything might be possible.
As for the rest of the map, we could see upwards of 8-10 shifts in the right environment.
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