Mimi Hall ponders in USA Today whether President Obama is losing control of liberal Democrats.  According to the White House, the answer is ‘no': White House spokesman Robert Gibbs routinely brushes off questions about whether Obama and the Democrats are losing key constituencies, but he says the notion that the president is taking liberals for granted is "silly." Mr. Gibbs would seem to be correct given recent poll numbers: Polls show those who represent a significant chunk of Obama's base still back him. Although the samples are small and the margins of error high, a USA TODAY/Gallup Poll taken in January found that nearly nine in 10 blacks approve of the job Obama's doing, as do more than seven in 10 liberals. Question:  Since a relatively narrow segment of the population (blacks), and a broader selection of the population (liberals) agree in their approval of Mr. Obama, why bifurcate their poll responses?  As the article says, "Polls...(Read Full Post)