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Bloomberg is much more aligned with the Democrats and would draw Liberals and Moderates away from the other Democratic Presidential Campaigns according to Douglas Wilder, Mayor, Richmond, Virginia.
As an Independent Candidate, Democrats fear that he could siphon as much as 12% of the national vote away from their campaigns. When H. Ross Perot ran as a 3rd party candidate in 1992 he ended up with 19% of the vote.