Players in four states will be registering some big gambling votes when the polls open in a few weeks. The legalization of sports betting is set to be decided in Louisiana, South Dakota and Maryland. While Nebraska voters will decide if they want to allow land based casinos. South Dakota’s sports betting bill is simply whether to change the state constitution to allow in-person sports betting at Deadwood’s casinos. Nebraska has three initiatives all relating to the issue, and if all three pass it will no longer be one of the few states in the union without casino gambling. Louisiana’s…