Voters in swing state Wisconsin will have another choice to make after casting their ballots for president in November — whether to explicitly bar foreign nationals from voting. At the bottom of the ballot is a statewide referendum authored by Republican legislators asking for permission to amend the state constitution to clearly prohibit non-U.S. citizens from voting in any election held in the state. Part of a GOP push across the country, the move was spurred by municipalities in a handful of states letting noncitizens vote in local elections.