Vice President Joe Biden's two sons and wife are getting by on $1.50 a day to bring attention to world hunger. "I'm hungry. I'm very hungry," Hunter Biden told CNBC's Andrea Mitchell in an appearance with his brother Beau Biden to promote the Live Below the Line Campaign. Nearly 1.5 billion people in the world live below the poverty line and are forced to subsist on the equivalent of $1.50 a day. Hunter Biden, chairman of the board of World Food Program USA, is living on $1.50 worth of food for five days. Beau and their mother, Jill, are participating...