Veteran far-right leader Marine Le Pen is riding high in the polls
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A protester is sprayed with water from a water cannon during a May Day rally in Nantes
The Paris march was marred by complaints of violence towards left-wing marchers
Some protesters were carrying far-left anti-fascist flags
The radical left has often accused the moderate PS of betrayal
All-black-clad protesters harassed marching lawmakers and supporters of France's moderate left Socialist Party (PS) on Thursday, marring Paris…