A talk-show host this weekend on MSNBC, widely considered a heavily left-leaning news network, suddenly erupted into a screaming rant after one of her guests suggested Obama wasn’t acknowledging the “risks” entrepreneurs take in America’s economy. “What is riskier than living poor in America? Seriously!” host Melissa Harris-Perry shouted on her self-titled show yesterday. “I am sick of the idea that being wealthy is risky!” Harris-Perry was discussing welfare reform and economic class mobility with a panel of guests. One guest, Nancy Giles, described as a “social commentator,” suggested it was public education and low-cost health care that enabled people...