It is the latter makeup job that has been superimposed over the face of President Obama in an anonymous Los Angeles poster campaign that is now the talk of the blogosphere, the airwaves and the 24/7 hermeneutical speculations of cable television. The image, which appears above the word "socialism," delights and distresses people roughly on the lines of the usual political cleavage, with wide agreement that the as-yet-unrevealed artist certainly intends it to be disrespectful. But there is little consensus about whether it is effective as political messagemaking.