David Axelrod, Alex Castellanos, James Carville, and Newt Gingrich speak during Politicon at the Los Angeles Convention Center on October 10, 2015 in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)

The business of campaigning is massive. And booming.

Plaintiff Jim Obergefell holds a photo of his late husband John Arthur as he speaks to members of the media after the U.S. Supreme Court handed down a ruling regarding same-sex marriage June 26, 2015 outside the Supreme Court in Washington, DC. The high court ruled that same-sex couples have the right to marry in all 50 states. (Photo by Alex Wong/Getty Images)

A conversation with Jim Obergefell about his new book and the road to marriage equality.

Make conventions great again

Will Philadelphia be full of surprise, drama and who knows what else?

Supporters reach for Democratic presidential candidate, Sen. Bernie Sanders (D-VT) at a campaign rally at VenturaÊCollege on May 26, 2016 in Ventura, California. The California primary is June 7. (Photo by David McNew/Getty Images)

Why are young voters supporting Bernie?

Barack Obama and. Hillary Clinton attend a campaign rally together at Amway Arena October 20, 2008 in Orlando, Florida. (Photo by Joe Raedle/Getty Images)

New York Times White House correspondent Mark Landler discusses his new book, “Alter Egos: Hillary Clinton, Barack Obama”.