Tuesday is a big day for Obamacare. The online marketplaces where people can shop for health insurance are supposed to open for business.
No one really knows who is going to sign up — not the Obama administration, not the insurance industry, not the president's critics. Yet the success of the law hangs on this question: Will the right mix of people sign up? In particular, will healthy people buy health insurance?
"The danger if you don't get young, healthy people signing up ...
