I’d say Big 10 states (i.e. the Midwest plus PA) are where we we made the most gains, including:
Minnesota: House seat, the state legislature
Wisconsin: Governor, state legislature, two House seats, Senate seat
Iowa: Governor
Illinois: a Senate seat, three or four house seats and maybe Governor
Indiana: a House seat, Senate seat, state House
Michigan: Governor, two House seats, state House
Ohio: Governor, two house seats, state House
Pennsylvania: Governor, Senate seat, five House seats, state House
Did I miss anything?
I love that Iowa voted out 3 judges that supported gay marriage.