Since we're still early in the process, I'm trying to take into account all GOP candidates homestates.
Judging by approval ratings, trends, personal opinions...
Next states to switch:
Missouri- Barely Democrat to Toss-up
Michigan- Lean Democrat to Barely Democrat
Florida- Toss-up to Lean Republican
Virginia- Barely Democrat to Toss-up
NE-02- Barely Republican to Lean Republican
Georgia- Barely Republican to Lean Republican
South Dakota- Lean Republican to Strong Republican
New Jersey- Strong Democrat to Lean Democrat
New Mexico- Strong Democrat to Lean Democrat