By Jeff Mason BUFFALO, N.Y. (Reuters) -President Joe Biden arrived in New York state on Tuesday to console families of victims of a white teenage gunman who targeted a Black community, as the racist violence that inspired his presidential run erupted anew. Biden traveled to Buffalo, New York, where authorities say Payton Gendron, 18, carried out an act of “racially motivated violent extremism” when he opened fire with a semi-automatic rifle on Saturday at the Tops Friendly Market in a predominantly African-American neighborhood of Buffalo. He struck 13 people with gunfire, killing 10. Biden wi…