JARRETT RENSHAW and JAMES OLIPHANT DEMOCRATIC presidential nominee Joe Biden put himself squarely in the middle of U.S. tumult over racial injustice and police brutality on Thursday, visiting strife-torn Kenosha, Wisconsin, and speaking by phone with the Black man shot there by police. Biden's made the trip to the city, the site of sometimes violent protests since Jacob Blake was shot in the back several times by a white police officer on Aug. 23, two days after President Donald Trump traveled there. The visits had starkly different tones. Biden met privately with Blake's family on the grounds of the Milwaukee…