I told you guys the Dem wave is building. Maybe next time you'll listen.
Rasmussen is both a dem biased pollster and a rep biased pollster, frequently switching between the two at random intervals. It is definitely not something to treat like a perfect crystal ball.
Secondly, if there's a really a democratic gubernatorial wave, then we'd expect incumbents such as Nikki Haley, Susana Martinez, and Terry Branstad to be in more trouble. We'd expect Walker and Snyder to be in Lean D races. We'd expect people such as Coakley and Hickenlooper to be close to safe, and we'd expect people like Malloy and Crist to be in far better shape. In order for a wave to occur, you need a strong uniform effect across the country, not just a desirable effect in a few select races.
That is not bias which you are referring to. Rasmussen is still a GOP-biased firm, its just than on occasion its imprecision exceeds its inaccuracy, as with this Arkansas poll.