Obamacare: 3 years in, it faces steep challenges

The Affordable Care Act is sure to survive the latest vote scheduled for Thursday by the House of Representatives to repeal it — since the Senate doesn't plan to take it up and President Obama would veto it if it somehow reached his desk — but the administration's signature legislative achievement still faces serious perils ahead.

Americans have a dimmer view of the health care law now than they did when Obama triumphantly signed it three years ago, according to monthly tracking polls by the Kaiser Family Foundation. The public's...