As usual, the American people aren't stupid.
In January, 2009, at the end of the Bush administration, half blamed the Republicans for the sorry state of the economy, and less than one quarter blamed the Democrats.
Today, 18 months into the Obama administration, 28% say the Democrats are responsible for our economic problems, and about 40% still blame the Republicans.
With each passing month, more blame falls on Obama and the Democrats, and less on Bush and the Republicans. That's only logical.