I've noticed that Rasmussen is more to the left of most polls this cycle compared to 2004 and 2008 when they were to the right. Hopefully they're the most accurate because that's what I go by.
Nationally, they tend to be better than Gallup. For states, they are better than nothing.
There are 2 things I like about Rasmussen that leads me to follow them above all other polls. They have daily reports and they poll states at least once or twice a week. Did you happen to see that they polled 4 states at once this past week? FL, NC, VA, and OH if I'm remembering correctly.