The State of Michigan is trying to ban straight party voting. Legislation was passed by the state legislature and signed by the Governor to implement the ban. A federal judge has truck it down as unconstitutional.
To me, another issue is that this is another example of politicians not representing the people. Twice the question was put on the ballot and both time the citizens of the state of Michigan voted own the ban. The latest legislation has spending attached, which makes it not subject to referendum. So, the voters in the state don't even have the ability to once again deny this change.