Missouri.
Democrats have a higher floor in South Carolina, largely because
non-Hispanic whites make up 64% of the population in South Carolina compared to 80% of the population in Missouri.
But white voters in the Midwest (or...whatever you want to call Missouri) are far more elastic than white voters in the Deep South, where voters are deeply racially polarized. For the same reason, a Senate candidate like Jason Kander wouldn't have had a chance in South Carolina, but he very well could have won Missouri in a slightly better year for Democrats.
Poll
