You can register to vote on Election Day in the following states: AK, CA, CO, CT, HI, ID, IL, IA, ME, MD, MI, MN, MT, NV, NH, NM, RI, UT, VT, VA, WA, WI, WY, and Washington, D.C.

So if you're in those states and haven't registered, today is the last day to register and vote.