Obama's State of the Union Address--Not Entirely True?

When President Obama said this during his State of the Union Address, Justice Alito appeared to disagree:

Last week, the Supreme Court reversed a century of law to open the floodgates for special interests – including foreign corporations – to spend without limit in our elections. Well I don’t think American elections should be bankrolled by America’s most powerful interests, or worse, by foreign entities. They should be decided by the American people, and that’s why I’m urging Democrats and Republicans to pass a bill that helps to right this wrong.

I believe Obama's claim that the Supreme Court "reversed a century of law" was not true, and I think Alito said so.