A huge ego and a few billion dollars can cause an awful lot of mischief.
Michael Bloomberg is weighing a possible run for the White House. This is frightening for a couple of reasons. First, consider the prospect of a half-billion-dollars worth of 30-second Bloomberg-for-president ads running all day and all night on television screens in every part of the country.
Americans of every persuasion will have images of the mayor of New York all but burned into their retinas.
For Democrats, the other reason is much more frightening. If Mr. Bloomberg actually decides to run, he risks becoming the Ralph Nader of 2008, drawing votes away from the Democratic nominee and helping to install yet another Republican in the White House.
(Mr. Nader is also making noises about running next year, but it’s generally agreed that Mr. Bloomberg has a much more credible shot at being a spoiler.).......
http://freedemocracy.blogspot.com/2007/06/bob-herbert-mr-mayor-nader-of-08.html