The Supreme Court upheld President Obama’s health-care mandate on Thursday, handing the White House a major victory but providing the Republicans with ammunition for the upcoming election. The law had been based on a provision that required all Americans to buy health insurance. That law survived as a tax. Four justices dissented, but Chief Justice John Roberts joined the majority opinion and said that the mandate is constitutional. "What the court did not do on its last day in session, I will do on my first day if elected president of the United States. And that is I will act to repeal Obamacare," Mitt Romney declared following the announcement. "Our mission is clear," he said. "If we want to get rid of Obamacare, we're going to have to replace President Obama. My mission is to make sure we do exactly that." Obamacare opponents may not have to wait that long, however. House Majority Leader Eric Cantor announced that the House will vote on repealing the law on July 11.