From NBC's Kelly O'Donnell
Sources tell NBC News that Massachusetts Republican Scott Brown could be installed as Massachusetts' junior senator as early as tomorrow afternoon. Previously, Brown was expected to take the oath one week later, on Feb. 11.

Today, Brown's legal counsel sent a letter to Massachusetts Gov. Deval Patrick and Secretary of State William Galvin asking that the certification of his election be completed by tomorrow morning. The letter indicates that Brown has been advised there are a "a number of votes scheduled" before the original swearing in date.