Alaskan Polling

As we see that Lisa Murkowski might actually lose her grudge match against Palin clone Joe Miller, I wonder why polling of Alaskan races trends far to the left of actual reality. Murkowski was supposed to blow Miller out; all the stories were written about the slap in Palin's face. Yet this is very much not the case. Similarly, in 2008 Mark Begich was supposed to destroy the scandal-riven Ted Stevens and longtime Republican Rep. Don Young was also likely to lose. Yet Begich barely squeaked out a win and Young won fairly easily.

What's up with this? Do they not poll the lunatics who live in the middle of nowhere, crawling out of their caves covered in animal furs to vote for the farthest-right candidate possible?