....But while Roberts may have saved Obama's signature domestic legislation — and perhaps his reelection campaign — by siding with the court's liberal wing, he actually did it in spite of Obama, not because of him. Roberts' opened his opinion today by declaring, unequivocally, that the individual mandate — which requires people to buy insurance or pay a penalty — is not constitutional under the Commerce Clause or the Necessary and Proper Clause. It's a direct shot at the Obama administration's defense of the law's constitutionality, which largely relied on those two clauses, which give Congress the power to regulate...