Miami Mayor Manny Diaz's time as head of the U.S. Conference of Mayors has come to an end, and usually the sitting American president sends administration officials to the conference -- this year held in Providence, Rhode Island -- but the Obama administration pulled out.
The reason: Providence Mayor David Cicilline is in a labor dispute with the firefighters' union, and the group was picketing the event. Vice President Joe Biden was scheduled to attend, but the White House said it would not break its policy of not crossing picket lines.
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