Barack Obama dropped into negative territory in Gallup for the first time today, and I can tell you one big reason why from our polling.
Since the calendar turned to 2010 there has been a noticeable drop in Obama's approval among people who say they voted for him in 2008. Our monthly surveys from August to December found him at anywhere from 89 to 93% approval with his original voters. Our January to March polls have shown that number down in the 83 to 85% range.
Most of Obama's approval drop over the course of 2009 was the result of people who voted for John McCain but initially wanted to give Obama a chance shifting from approval to disapproval of him over the course of his first year. That was really no big deal for Obama and a perfectly normal thing to happen to any President once the honeymoon is over. But this drop in support he's seeing now from his core supporters is a more troubling sign and something he's going to need to overcome.