|Indiana House of Representatives Chamber|
One state though far and away dominated the google search - New York. New York is one of the few states with a full-time legislature. I should point out that most of the stories about how bad New York's state legislature is (or was?) was written before the recent passage of the law allowing same sex marriage.
Until I find some scholarly articles rating Indiana as the "worst state legislature," I'm going to continue being dismissive of the term as yet more evidence Hoosiers have an inferiority complex.