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GOP has spent $8 million on ads for debate

Find out the names of the biggest spenders, according to the latest ad-buying data.

(Photo by Carlos Barria/Pool/AP)
British Foreign Secretary Philip Hammond, 2nd right, U.S. Secretary of State John Kerry, right, and European Union High Representative for Foreign Affairs and Security Policy Federica Mogherini, left, talk to Iranian Foreign Minister Mohammad Javad Zarif as the wait for Russian Foreign Minister Sergey Lavrov, not pictured, for a group picture at the Vienna International Center in Vienna, Austria, Tuesday, July 14, 2015.AP

Chuck Todd

Chuck Todd is NBC News' chief political analyst and the former moderator of "Meet The Press."

Mark Murray