Depending on your perspective, President Obama's performance at the White House Correspondents Dinner Saturday night was either funny or filled with rage. Or perhaps it was funny about being filled with rage. Either way, there's no doubt that Obama, by incorporating comedian Keegan-Michael Key into his act, went public with the anger — specifically, the black anger — that has become part of the general conversation about Obama's time in office. Key and partner Jordan Peele do a Comedy Central routine in which Peele, playing Obama, delivers a calm, measured speech while Key, playing Obama's "anger translator," named Luther, acts...