The number one reason: Supreme Court Justice appointments. Republican appointed Justices have bought us Citizens United. That's basically had the effect of selling off our government to the highest bidder. Unhappy with your candidate? You can thank unlimited pac money. Bought to you by you Republican appointed justices.
Couldn't agree more.
And it's not just appointments to the Supreme Court, but the Federal courts as well.
Indeed, one is not voting for president, but voting for judicial appointments.
The last thing Americans need is a republican president making judicial appointments of reactionary judges and justices hostile to privacy rights, equal protection rights, due process rights, and voting rights.