It signals potential trouble for the President among what might be thought to be his two core constituences: (1) the hard left and (2) the African American community.
At the moment, the support of minority groups -- especially blacks -- are what are keeping the President's poll numbers from cratering. He's already in trouble with the lefties for his decisions on everything from health care to Afghanistan.
Thus, having a prominent far left-wing African-American like Conyers, with a long history that includes marching with Dr. King, be willing to come out and criticize the President is something like the perfect storm for an Obama White House.
No wonder the President is pushing back. The problem is that he's projected an image of weakness so long -- not just internationally but here at home -- that no one on Capitol Hill is afraid of him. Especially as his poll numbers continue to decline.
Incidentally, has anyone else noticed that the only time the President seems ready to stand up and get tough is when someone attacks Himself?