(CNN)Sen. Rand Paul on why he is running for president and Hillary Clinton's expected announcement.
Former Rhode Island Gov. Lincoln Chafee tells why might challenge Hillary Clinton for the Democratic presidential nomination.
Plus, live coverage of Hillary Clinton's presidential announcement with some of the people who know her best, including Sen. Debbie Stabenow and former Sen. Mary Landrieu.
Dana Bash hosts State of the Union on Sunday - Live at 9am, 12p and 1p ET.