Remember yesterday’s “dorky poll” that I showed was badly skewed?
August 2, 2012: Pew “If the election were today” poll of Registered Voters
Obama 51% vs. Romney 41% vs. Not Reported 8%
http://www.people-press.org/2012/08/02/romneys-personal-image-remains-negative/
Compare it with this one.
Friday, August 3, 2012: Rasmussen “If the election were today” poll of Likely Voters
Romney 47% vs. Obama 43% vs. Other 5% vs. Undecided 5%
http://www.rasmussenreports.com/public_content/politics/obama_administration/daily_presidential_tracking_poll

These polls both have MOEs in the 3-4 point range. Let’s just suppose both are off by the maximum.
Pew: Obama + 10 becomes Obama +6
Rasmussen: Romney +4 becomes Tied.
They’re not even in the same ballpark. Obviously, I think Rasmussen is closer to the truth.
If you like this, you might also enjoy https://polination.wordpress.com/2012/08/03/another-dorky-poll/