I think that essentially, because of the supreme court's interpretation of money as speech, it would be very difficult to pass a law to get money out of politic

I think that essentially, because of the supreme court's interpretation of money as speech, it would be very difficult to pass a law to get money out of politics without the SCOTUS overturning it. So at that point you need a constitutional ammendment or to pack/replace the supreme court. Both of these are incredibly ambitious things to do. So it's probably that this freedom bucks idea is a way of dis-empowering the private money in politics by making it compete with public money.