Supreme Court Justice Samuel Alito seemed particularly miffed tonight when President Obama took issue with the court's recent decision on campaign finance.

Alito, who was in the front row of Obama's State of the Union with the rest of the justices, shook his head and mouthed "not true" when Obama said that the court's decision in Citizens United v. FEC would "open the floodgates" to corporate spending in campaigns.

In that decision, the court struck down limits on independent expenditures by corporations and labor unions.

Supreme Court justices always sit near the front of the audience during States of the Union, but are usually particularly muted so as not to reveal their personal opinions. Not so for Alito.

Watch the video here: