Very often, Rasmussen comes up with polls unfavorable to Democrats shortly after independent polls find the opposite. Recently, ABC/WaPO found Hillary with her highest-ever favorability. Today Rasmussen came up with a well-timed poll finding the opposite (Her favorability now matches an all-time low there, he says).
For some strange reason, Rasmussen polled likely voters, as if Hillary were running for something.
http://www.washingtonpost.com/wp-srv/politics/polls/postabcpoll_20120422.html
http://www.rasmussenreports.com/public_content/politics/obama_administration/april_2012/53_view_hillary_clinton_favorably
Rasmussen constantly attends Republican fundraisers where he gets paid lots of money, as reported by Media Matters:
http://mediamatters.org/blog/201203300007