Looking at Rasmussen's cumulative daily tracking poll, Obama slipped below 50% approval around July and August of 2009.

That would coincide with the growing uneasiness of the public over the Stimulus bill, Omnibus bill, his first 1.6 trillion deficit budget, and apparently the public reached its limit with Obama when Obamacare was rammed through, with well over 50% of the public opposing it.

Especially after billion-dollar perks were given to Landrieu and Ben Nelson and Bill Nelson to purchase their votes, as well as exemptions for certain corporations and unions favoring Obama.