Street, a former hot dog vendor who served terms in the state House and Senate, built his 2011 campaign against Nutter around what he called the "don't counts" - former inmates, the mentally ill, and the poor. He won at least 40 percent of the vote in seven primarily African American North Philadelphia wards.
That could make Street, older brother of former Mayor John F. Street, something of a spoiler if he peels votes away from other black candidates. The two most prominent potential black candidates are State Sen. Anthony Hardy Williams and City Council President Darrell L. Clarke.
Milton Street, who was sentenced to 30 months in prison in 2008 for failing to file three years worth of tax returns, had some prominent backing in 2011 that he is unlikely to get this time around. In 2011, he drew endorsements from two municipal workers unions - AFSCME District Council 33 and Local 22 of the firefighters - that were frustrated over contract fights with Nutter.
Street could not be reached for comment Monday.
In his post, Street said he considered supporting Williams in the Democratic primary, but thought Williams would be a "disaster" for the black community. Street cited campaign contributions Williams took from three executives of the Susquehanna International Group in 2010, when he ran for the Democratic gubernatorial nomination.
Williams accepted more than $5 million from the three men, who said at the time that they favored Williams' position on school choice and publicly funded vouchers. Williams finished third in that race.