(AP) — An anti-tax group sued state officials Tuesday in an effort to block an advisory ballot measure that seeks to overturn the U.S. Supreme Court's Citizens United campaign finance decision. The bill by Sen. Ted Lieu, D-Torrance, puts a nonbinding measure on the November ballot asking voters if they want a federal constitutional amendment to restrict corporate campaign giving. The only way to overturn the decision is for Congress to convene a constitutional convention, Brown said, a step that the Legislature called for in a separate joint resolution.