Amid their posturing is anxiety that Mr. Clinton could deliver black votes to Mr. Emanuel. The campaign's first vivid manifestation of racial politics turned on the realities that the black vote is far from monolithic, as Mayor Richard M. Daley has shown, and that Mr. Davis and Ms. Braun need its rock-solid support for either of their candidacies to succeed.
What's curious, too, is a misunderstanding of history. Yes, people all around town associate Mr. Emanuel with Mr. Obama. But many most likely do not know the depth of the Clinton-Emanuel alliance.