The dark red states (AR, WY, NE, WV, SD, TN, ID, OK, LA, KY, and MS) have Republican senators up for re-election who are unlikely to be unseated. The dark blue states (RI, MA, DE, IL, NJ, OR, VA, NH, NM, and MN) have Democratic senators up for re-election who are unlikely to be unseated. The gray states (WA, CA, NV, UT, ND, MO, IN, OH, PA, NY, MD, CT, VT and FL) do not have Senate elections in 2020.
The light blue state of Alabama has a Democratic senator who is likely to be unseated by a Republican. The blue-purple state of Michigan has a Democratic senator who is likely to hold onto his seat against a Republican insurgence.
The purple states of Arizona and Colorado have Republican senators who are most likely to be unseated by a Democrat. The light purple states of Maine, Montana and North Carolina have Republican senators who could well be unseated by a Democrat.
And the light red states of South Carolina, Georgia and Iowa have Republican senators who could possibly be unseated by Democrats.
Hover over each state to see more information and click on the state for details of Senate races as well as other 2020 election information.