I've been watching "realclear," as they show all the popular polls; though, I don't like how their map updates [litterally, but the blue trends Bob noted from Rasmussen too aren't pretty at that].
Also, until about a week ago, I thought Rasmussen was more stable [no idea whether more or less actuate, just seemed to change slower and in the trends one would suspect with current MSM news] than Gallup, then that reversed, so I'm not sure if registered voters are firming up to be mostly likely voters and some likely aren't bothering to register - or if one, the other or both radically changed their weighting. I believe Rasmussen updates their weighting system weekly.