Delegate math means a rocky road to the GOP nomination

Aired: 2/5/2016 | 0:10:14 | Clip
Although primaries and caucuses are scheduled through June, presidential candidates in both parties may emerge with enough delegates to secure the nomination before then. But given the different sets of rules for choosing delegates in each state, a long road to the White House remains. NewsHour Special Correspondent Jeff Greenfield reports.

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