MSNBC has named a permanent successor for its struggling 9 p.m. ET primetime weeknight slot now that longtime anchor Rachel Maddow has shifted to a one-day-per-week format. Alex Wagner will anchor MSNBC’s 9 p.m. hour on Tuesdays through Fridays beginning on August 16, the network confirmed in a press release. MSNBC said the program’s name will be...