By Mark Willen, Senior Political Editor January 29, 2008 Another thought on endorsements. While they don't swing many votes as a rule, the Kennedy clan backing Obama may be very different. Kennedy is a great campaigner in his own right, and his plan to appear in Arizona, New Mexico and California over the next week could have a significant impact on Hispanics, who so far have been overwhelmingly in the Clinton camp. (The Wall Street Journal has a timely look today on the historical enmity between blacks and Hispanics.) Add to that the fact that Kennedy's endorsement was front page news for two days running, the importance of the "New Frontier" mantle and the growing sense that the Democratic establishment is growing disenchanted with Hillary and Bill Clinton.