Congress' longest-serving member and a fierce health care advocate vowed Friday to push ahead with Democratic-led efforts to extend coverage to all, saying he won't be intimidated by protesters who disrupted his town-hall meetings. "I am eager to talk about the bill with anyone who wants to discuss it. That doesn't open the door to everyone who wants to demagogue the discussion," Rep. John Dingell, D-Mich., said in a statement the day after holding back-to-back sessions that got so raucous police had to escort people out. Dingell's response to the furious crowd came as the Obama administration stepped up its...