The New York Times provides a thorough obituary. One quote of interest for third party junkies:
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His greatest impact came through mobilizing his followers, sometimes called “Newmanites,” to build alliances with third parties, including that of the Texas independent H. Ross Perot.
“If it weren’t for the Independence Party, Mike Bloomberg might not have become mayor,” said Douglas Muzzio, a professor of public affairs at Baruch College.