How many other states have this?
Anyone know?
Idaho, Iowa, Maine, Minnesota, Montana, New Hampshire, North Carolina, Wisconsin, Wyoming and Washington DC.
Montana began Election Day voter registration in 2006, North Carolina in 2007, and Iowa in 2008. Connecticut and Rhode Island also have Election Day registration, but only for presidential elections. (North Dakota, unique among the states, has no voter registration requirement at all.)
Twelve for presidential elections.