What is a brokered convention?
A brokered convention is when no candidate has a majority of the delegates needed to secure the nomination. In the past, things have gotten hairy.
01:35 - Source: CNN
Super Tuesday 46 videos
brokered convention possibility explained orig_00000000.jpg
What is a brokered convention?
01:35
Now playing
- Source: CNN
clinton trump woman card origwx bw_00001517.jpg
Hillary Clinton and Donald Trump on the 'woman card'
00:47
Now playing
- Source: CNN
hillary clinton super tuesday 4 philadelphia
Super Tuesday in under 90 seconds
01:23
Now playing
- Source: CNN
Highlights from Super Tuesday 4 speeches
00:10
Now playing
- Source: CNN
Republican frontrunner Donald Trump speaks at Trump Tower in New York on April 26 after winning primaries in Pennsylvania, Maryland, Connecticut, Rhode Island and Delaware.
Donald Trump: I'm winning, why should I change?
01:37
Now playing
- Source: CNN
hillary clinton super tuesday 4 philadelphia
Clinton: Our campaign is about restoring confidence
00:56
Now playing
- Source: CNN
van jones donald trump bizarre outcome sot ac_00002728.jpg
Van Jones: Donald Trump's sweep a 'bizarre outcome'
01:23
Now playing
- Source: CNN
sanders super tuesday 4 west virginia
Sanders: We have bigger lead over Trump than Clinton
01:05
Now playing
- Source: CNN
Ted Cruz Knightstown Indiana 04262016
Ted Cruz: Trump 'likely to win some states'
01:55
Now playing
- Source: CNN
donald trump super tuesday 4
Trump: Hillary will be easier to beat than others
01:07
Now playing
- Source: CNN
HAGERSTOWN, MD - APRIL 24:  Republican presidential candidate Donald Trump speaks while campaigning at the Hagerstown airport April 24, 2016 in Hagerstown, Maryland. Maryland holds their presidential primary on Tuesday, along with Delaware, Pennsylvania, Rhode Island and Connecticut.  (Photo by Win McNamee/Getty Images)
Polls shows voters warming towards Trump nomination
01:23
Now playing
- Source: CNN
trump cruz kasich clinton sanders t1 comp politics app safe
3 things to watch for on Super Tuesday 4
02:09
Now playing
- Source: CNN
Bernie Sanders May 27 2015
Jane Sanders: Bernie 'will not play role of spoiler'
00:54
Now playing
- Source: CNN
Democratic presidential candidate former Secretary of State Hillary Clinton speaks during her primary night gathering on March 15, 2016 in West Palm Beach, Florida.
Highlights from Super Tuesday 3 speeches
02:20
Now playing
- Source: CNN
Trump Magazine
Highlights from the Super Tuesday 2 speeches
02:04
Now playing
- Source: CNN
best of super tuesday speeches wrap origwx nws_00004301.jpg
The best of the Super Tuesday speeches
01:41
Now playing
- Source: CNN
super tuesday coverage two minutes origwx js_00005610.jpg
Six hours of Super Tuesday coverage in 2 minutes
02:03
Now playing
- Source: CNN
Saturday Night Live Trump hand size orig vstan dlewis_00000000.jpg
'SNL' mocks Trump's hand-size feud
01:03
Now playing
- Source: CNN
Trump and Clinton
Two victory speeches, two different messages
01:22
Now playing
- Source: CNN
Hillary Clinton Arizona win primary speech sot  _00001913.jpg
Clinton: Contest between fundamentally different views
00:56
Now playing
- Source: CNN
Bernie Sanders Hillary Clinton
Super Tuesday scenarios: Can Sanders slow Clinton?
02:19
Now playing
- Source: CNN
HOUSTON, TX - FEBRUARY 25:  Republican presidential candidates  Florida Sen. Marco Rubio (R-FL), Donald Trump, and Texas Sen. Ted Cruz (R-TX) stand on stage for the Republican National Committee Presidential Primary Debate at the University of Houston's Moores School of Music Opera House on February 25, 2016 in Houston, Texas. The candidates are meeting for the last  Republican debate before the Super Tuesday primaries on March 1.  (Photo by Joe Raedle/Getty Images)
Super Tuesday scenarios: Can Donald Trump be stopped?
01:47
Now playing
- Source: CNN
Bernie Sanders speaks during a campaign rally at West High School on March 21, 2016 in Salt Lake City, Utah.
Bernie Sanders: We're gaining on Clinton
00:45
Now playing
- Source: CNN
trump clinton split portrait
CNN projection: Trump, Clinton win Arizona Primary
00:53
Now playing
- Source: CNN
super tuesday march 15 in 2 minutes origwx js_00005623.jpg
Six hours of Super Tuesday #3 on CNN in 2 minutes
01:57
Now playing
- Source: CNN
Kasich Clinton split
Projection: Gov. John Kasich, Hillary Clinton win Ohio
01:00
Now playing
- Source: CNN
Republican presidential candidate Ohio Governor John Kasich casts his ballot in Westerville, Ohio.
John Kasich: I will not take the low road
00:45
Now playing
- Source: CNN
Donald Trump victory speech sot ac_00010508.jpg
Donald Trump: We have to bring our party together
01:17
Now playing
- Source: CNN
CHARLOTTE, NC- MARCH 14:  Democratic presidential candidate former Secretary of State Hillary Clinton speaks during a Get Out the Vote event at Grady Cole Center on March 14, 2016 in Charlotte, North Carolina. Hillary Clinton is campaiging Illinois and North Carolina.  (Photo by Justin Sullivan/Getty Images)
Hillary Clinton: We're moving closer to the nomination
00:48
Now playing
- Source: CNN
RENO, NV - FEBRUARY 23:  Republican presidential candidate Donald Trump speaks at a rally at the Nugget February 23, 2016 in Sparks, Nevada. The Nevada GOP caucus is tonight. (Photo by David Calvert/Getty Images)
Donald Trump: Marco Rubio has a great future
00:59
Now playing
- Source: CNN
Rubio speech 0315
Marco Rubio: Not God's plan that I be president in 2016
00:49
Now playing
- Source: CNN
Bernie Sanders phoenix arizona truth sot ac_00000119.jpg
Bernie Sanders defiant despite primary losses
01:07
Now playing
- Source: CNN
CNN Candidate Photography
John Kasich
ph: Nigel Parry
John Kasich: We're proud of what we've done
03:25
Now playing
- Source: CNN
trump clinton split portrait
Projection: Donald Trump, Hillary Clinton win Florida
01:55
Now playing
- Source: CNN
SHELBURNE, MA - MARCH 01: Voters check in before casting their ballots in the Shelburne Town Hall on March 01, 2016 in Shelburne, Massachusetts. Officials are expecting a record turnout of voters in Massachusetts, one of a dozen states holding Super Tuesday presidential primaries or caucuses. (Photo by Matthew Cavanaugh/Getty Images)
High stakes for GOP on Super Tuesday
00:56
Now playing
- Source: CNN
john kasich votes for president media avail sot nr_00005310.jpg
John Kasich casts his vote in Ohio
00:54
Now playing
- Source: CNN
The assassination of Julius Caesar (100 - 44 BC) at the Senate in Rome, 15th March 44 BC. (Photo by Archive Photos/Getty Images)
Politicians, beware the Ides of March
01:54
Now playing
- Source: CNN
02 clinton sanders town hall split
Sanders hopes to replicate Michigan magic in Ohio, Illinois
03:58
Now playing
- Source: CNN
bernie sanders
Bernie Sanders wins case to allow 17-year-olds vote
01:44
Now playing
- Source: CNN
donald trump rally violence vstan orig cws_00002826
Donald Trump on rallies: There's not much violence
02:38
Now playing
- Source: CNN
donald trump bernie sanders composite
The fight for Mississippi and Michigan in 90 seconds
01:36
Now playing
- Source: CNN
Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks during a primary night rally in Essex Junction, Vt., Tuesday, March 1, 2016, on Super Tuesday. (AP Photo/Jacquelyn Martin)
Sanders: Michigan is proof of a political revolution
02:10
Now playing
- Source: CNN
Hillary Clinton speech to supporters sot_00014514.jpg
Clinton: Campaigns should be about results, not insults
01:47
Now playing
- Source: CNN
02 Trump screengrab 0308
Donald Trump talks about his steaks and wine
00:53
Now playing
- Source: CNN
Republican presidential candidate Donald Trump speaks during a news conference at the Trump National Golf Club, Tuesday, March 8, 2016, in Jupiter, Fla. (AP Photo/Lynne Sladky)
Donald Trump: Voter turnout biggest story in politics
01:26
Now playing
- Source: CNN
hillary clinton wins mississippi exit polls favor donald trump sot blitzer tsr_00001418.jpg
Hillary Clinton wins Miss. as exit polls favor Trump
00:55
Now playing
- Source: CNN