For recent precedent, Obama vacated his Senate seat in Nov 2008, his replacement was sworn in in Jan 2009. **Obama Resigns Senate Seat** November 13, 20084:11 PM ET https://www.npr.org/templates/story/story.php?storyId=96971100   **Roland Burris sworn in as Obama's replacement in the Senate** · Induction ends an embarrassing episode for Democratic party https://www.theguardian.com/world/2009/jan/15/roland-burris-senate-seat-obama