When neither party represents you people naturally feel the greatest anger at those they trusted in. I wouldn't be surprised if alot of people vote democrat as a way to get back at Republicans who have ignored those of us who have faithfully gone out and voted for what we thought was the party most in line with our ideals.
That would be an excellent way to prove how stupid you are.
Mad at Republicans? Vote for even more pain.
Broke your toe? Teach it a lesson by crushing your entire foot.
And feel superior while doing it.