Senate Democrats vented their frustrations over the faulty rollout of the Affordable Care Act in a meeting Thursday with White House chief of staff Denis McDonough and other senior officials. “There’s a lot of frustration, everywhere,” Sen. Dianne Feinstein (D-Calif.) said after the meeting. McDonough tried to assure angry senators he is personally taking charge of the disparate federal offices in charge of implementing the massive law, which has been plagued by technical errors. “He gave us the impression that he’s taking charge of the different elements and cracking the whip. He said to let him know if we had...