Something interesting:
Lisa Murkowski has a 44/41 approval rating but that is almost entirely from Democratic support.
She's at 34/56 among Republicans, 42/49 among those who are "somewhat conservative", and a staggering 19/64 among those who are "very conservative." However she is at 46/31 with "very liberal", 52/33 among moderate liberals, and 56/26 among moderates.
She's probably going to have another primary challenge in 2016, from somewhat more competent than Joe Miller. I wouldn't be surprised if she went full Lieberman, or switched parties all together.