The politician called out by name here, state senator Joe Hune, is a Republican. The Republican Party also controls the legislature that passed this bill: they

The politician called out by name here, state senator Joe Hune, is a Republican. The Republican Party also controls the legislature that passed this bill: they hold a supermajority (68%) of seats in the Michigan Senate, and a majority (54%) of seats in the Michigan House. And, the governor is a Republican. So I doubt the explanation for this case, at least, can be laid specifically at the feet of the Democratic Party trying to restrict trade.