Democrat Mark Kelly sworn in to U.S. Senate

• Democrats are hoping to take back the majority after two runoff Senate races in Georgia this January, which could move the balance to 50-50. Tie-breakers would be settled by incoming Vice President-elect Kamala Harris.
• According to a spokesperson, Kelly was sworn in on a Bible passed down from the grandmother of his wife, former Rep. Gabrielle Giffords. The couple also laid a wreath at McCain's grave on Tuesday.

Kadia Goba contributed to this report.