This website is just a wonderful source of information. It has every state and every political breakdown at the state level. It also has initiatives and referendums. It is a place we political info nuts just have to love.
Go here for great stuff.
For instance, Montana. A large geographical state but a population less than Sacramento County. Max Baucus is their senior US Senator, a democrat. He is the fellow that wrote, or was ghost wrote, Obamacare. The Senate of the State maintained a R majority but the House democrats (losing 17 of their 50 seats) were wiped out and the R's have control. This will bode ill for Max in a couple of years. He better be nervous.