An awful lot of people that don't care about either party will split their votes. The reasoning is usually something like they want a divided government so it makes it harder for govt to keep spending our money on stupid things. In their theory the sides will get along for the important stuff. That used to work a few decades ago when both sides would fight during the work day and then go have beers together in DC after work.

Vermont is full of independents so I would guess they could still do that.