• American politician George HW Bush and Dan Quayle raise their hands on a podium during a campaign rally, Huntington, Indiana, August 18, 1988. Among those also on the podium are Bush's wife, Barbara Bush (left), and Marilyn Quayle (in checkered outfit). The event was the first stop after the Bush/Quayle ticket had been nominated at the 1988 Republican National Convention, one day earlier. (Photo by Ed Lallo/Getty Images)
  • US President Bill Clinton (R) greets the crowd after giving a speech at a groundbreaking ceremony May 14, 1994, for a Martin Luther King Jr. and Robert F. Kennedy statue at the Martin Luther King Jr. Memorial Park in Indianapolis. (Photo by J. DAVID AKE/AFP via Getty Images)
  • US President George W. Bush makes remarks about the economy after meeting with small business owners on Sept. 5, 2003, in Indianapolis, Indiana. (Photo by STEPHEN JAFFE/AFP via Getty Images)
  • Democratic presidential nominee U.S. Sen. Barack Obama greets people during a campaign rally at American Legion Mall on Oct. 23, 2008, in Indianapolis, Indiana. (Photo by Joe Raedle/Getty Images)
  • Republican presidential candidate Donald Trump speaks to guests and supporters during a rally at the Indiana State Fairgrounds on April 20, 2016 in Indianapolis, Indiana. (Photo by Scott Olson/Getty Images)