The Florida senator is scheduled to speak at the Republican National Convention tonight.
Maddow recalls the moment that Pence froze while live on national television.
The failed presidential candidate had said earlier that the Orlando tragedy was a factor in his consideration of a second Senate term.
Omar Mateen had a history with the FBI, officials confirmed.
The Florida senator talks to The Advocate about what led to the attack.
Some politicians with antigay records appear genuinely moved.
Trump gets a key winner-take-all state and victories in three others. Marco Rubio ends his campaign, and John Kasich gets his first win.