One of former Mayor John F. Street's biggest financial backers - the Laborers District Council of Philadelphia & Vicinity - is throwing its weight behind Mayor Nutter in what is so far an uncontested primary.

The union is expected to endorse the Democratic mayor for re-election at the Convention Center at 11 a.m. tomorrow. It is the latest in a series of weekly endorsements that the campaign is matter-of-factly rolling out.

The largely African-American union supported one of Nutter's four rivals - Philadelphia state Rep. Dwight Evans - in the 2007 Democratic primary. Then, a few days before the 2007 general election, in which Nutter faced Republican Al Taubenberger, the laborers gave a last minute $19,000 contribution to the man who was most certainly to become mayor. That represented the union's first donation to Nutter, who previously served 15 years on City Council.

Click here for's politics page.