Which poll? (I'm not a subscriber, so if that's what it takes to confirm your point, don't bother)
I saw an Obama favorability numbers showing an increase over the last Rasmussen on the subject (confirming the same trend shown by everybody else). I'd have to assume that the trends Ras shows will follow the trends shown by other pollsters. They almost always do, even when Ras' actual numbers always show lower Dem and higher R.
(I'm not a Rasmussen subscriber, so if that's what it takes to confirm your point, don't bother)