Justice Kennedy will probably be the swing vote on a case concerning the individual mandate. Here is what he may well say against this linchpin of the Obama health-care law.The most targeted piece of President Obama’s health-care law is this mandate: Beginning in 2014, every American must purchase health insurance – under penalty of law. Except for the poor, elderly, and a few others, anyone who has not purchased insurance will face a hefty fine – 2.5 percent of one’s income.Never before...