Senator Barbara Boxer to Retire

After 30 years in Washington, US Senator Barbara Boxer says it's time to come home, and she won't run for re-election next year. She's been a liberal conservationist with a taste for confrontation, as opposed to compromise. Which Democrats -- and which Republicans -- are most likely to try to replace her?

Also, Southern California may be the world's most diverse metropolitan region, with all the elements that can make for trouble in the rest of the world. Will there be fallout from yesterday's massacre in Paris?

Photo: Senate Democrats