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What is a caucus?
30 Seconds to Know: Reporter for msnbc, Zach Roth, explains why some states have primaries and others have caucuses during a presidential election season. He also explains what happens at a caucus as opposed to a primary.
Republicans on msnbc
Touré: Trump is the king of birtherism19:14
Trump refuses to say whether he plans to pardon Paul Manafort04:25
Steve Bannon plots a comeback to help Trump ahead of midterms06:43
Who is Bruce Ohr & why is Trump suddenly talking about him?03:31
John Brennan: Donald Trump is 'drunk on power'09:18
Steve Bannon warns GOP: Dems could take control of House12:15