I believe he is honest, but I believe his methods are flawed. Swings like these are not reasonable. People aren’t flipflopping like this.
Rasmussen lost me when he wouldn't pick a winner in the Brown vs. Coakley race, when most every other pollster had Brown winning.
PPP (although they tilt left) is more accurate and consistent in their polling methodology, IMHO. Also, a cumulative analysis of polling results is required, some folks look at just what this one flawed prognosticator publishes and take it as truth. It isn't.