SEASON PREMIERE: It’s the start of season 15 of this long-running, increasingly valuable political and public affairs comedy talk show – with more talk, and sometimes less comedy, than the regular Sunday morning TV variety. Given what’s happened today, and since Maher went off the air for his winter hiatus, today’s return ought to be a doozy. And his guests, for the occasion, can be expected to pack quite a punch. They’re scheduled to include Jane Fonda at the start of the show, Keith Olbermann at the finish, and presidential historian Jon Meacham as one of the roundtable panelists.