It must be a significant drop in approval ratings, as even The Economist is discussing it:
Barack Obama’s approval rating at the end of 2009 marks an all-time low for him in the Economist/YouGov poll, and it is the first time more Americans disapprove than approve of the way he is handling his job. Mr Obama began his term with a 61% approval rating, while only 17% of Americans disapproved. As 2009 ends, only 45% approve of the way Mr Obama is handling his job, while 47% now disapprove.
The president has suffered a drop in approval from just about all groups, demographic and political. But perhaps most striking has been his loss of support from independents. In January’s poll, 64% of independents approved of how he handled the start of his presidency (and the days leading up to it). Now just 43% do.