In an election year, it is no surprise that the dial is turned up on the political rhetoric. But this year it is different, more exaggerated perhaps, because the stakes are so high.
I would characterize the difference in terms of party hostility. Both parties' participation in name-calling, derision, and personal attacks on opponents seems at an all-time vicious high. More important, however, is the lack of even the simplest debates on issues. The underlying cause is that both parties are in indefensible positions.