Prominent Black Lives Matter activist DeRay Mckesson said Wednesday he is attending a meeting with President Obama designed to help mend frayed ties between law enforcement and the communities they serve. “We are at the @WhiteHouse right now for a 3-hour convening w/ President Obama re: the recent events in #BatonRouge & across the country,” Mckesson tweeted Wednesday. Mckesson wrote he will be joined by fellow activist Brittany Packnett and Minneapolis-based Black Lives Matter leader Mica Grimm. The president is sitting down with nearly three-dozen law enforcement officials, civil rights leaders, educators and local politicians at the White House in...