AllOtsego People For Sorins, film success is contagious By GREG KLEIN • Special to www.AllOTSEGO.com For Cooperstown’s Gretchen Sorin, the only thing that might top the success she has had in the past two years is seeing one of her children share in and build off of that success. Sorin, the director of the Cooperstown Graduate Program, author of the best seller, “Driving While Black, African American Travel and the Road to Civil Rights,” and co-director of the PBS documentary…