MEGAN MCARDLE: Four Things We Think We Know About ObamaCare: “I’ve been seeing a few things floating around the blogosphere about Obamacare that aren’t true. They’re not really conservative or liberal talking points; they’re just misconceptions that people may have about how the health-care law works. So it seems worth pointing them out, especially because relying on some of these ‘facts’ could get you into big trouble.”