Fox is usually a solid pollster. As Rasmussen drifted into obscurity, Fox managed to limit their bias.
I have a very difficult time believing Bush us the best performing Republican after the Q, CNN and PA (and now ABC) polls though. I don't think thats personal anti-Bush bias. Them leaving off a contender like Paul (after the debacle last week) shows they have motives though.
What do you mean "after last week"? Note what dates this poll was taken. And for that matter, when this thread was started.