John McCain: Through the Years SAN DIEGO, CA - MAY 28: (L-R) Republican presidential candidate, former Massachusetts Gov. Mitt Romney, Kim Dang Trang and U.S. Sen John McCain prepare to lay wreaths during a Memorial Day Tribute at Veterans Museum & Memorial Center on May 28, 2012 in San Diego, California. U.S. Sen John McCain (R-AZ) joined Mitt Romney at a Memorial Day tribute before heading to Colorado. (Photo by Justin Sullivan/Getty Images)Photo by: Justin Sullivan John McCain: Through the Years ORLANDO, FL - AUGUST 18: Presumptive Republican presidential nominee U.S. Sen. John McCain (R-AZ) gestures before speaking to the Veterans of Foreign Wars national convention as his wife Cindy McCain looks on August 18, 2008 in Orlando, Florida. U.S. Sen. Barack Obama (D-IL) will speak to the same convention Tuesday. (Photo by Matt Stroshane/Getty Images)Photo by: Matt Stroshane John McCain: Through the Years CASA GRANDE, AZ - APRIL 24: U.S. Sen. John McCain (R-AZ) poses for a picture with veteran Richard Philippi at VFW Post #1677 during a campaign stop on April 24, 2010 in Casa Grande, Arizona. McCain, who is seeking a fifth term in the Senate, will challenge former congressman and radio personality J.D. Hayworth during the primary. (Photo by Joshua Lott/Getty Images)Photo by: Joshua Lott John McCain: Through the Years WASHINGTON, DC - FEBRUARY 12: Sen. John McCain (R-AZ) hugs Susan Selke, mother of Clay Hunt after President Obama signed the Clay Hunt Suicide Prevention for American Veterans Act while flanked by first lady Michelle Obama and members of Congress during an event in the East Room of the White House, February 12, 2015 in Washington, DC. Clay Hunt, a U.S. Marine veteran who served in Iraq and Afghanistan, battled with post-traumatic stress disorder and took his own life at the age of 28. (Photo by Mark Wilson/Getty Images)Photo by: Mark Wilson John McCain: Through the Years COVINGTON, LA - OCTOBER 13: U.S. Senator John McCain (R-AZ) (L) greets supporters during a Veterans rally for U.S. Sen candidate and U.S. Rep. Bill Cassidy (R-LA) at the American Legion Post on October 13, 2014 in Covington, Louisiana. Cassidy is running against incumbent U.S. Sen. Mary Landrieu (D-LA). (Photo by Sean Gardner/Getty Images)Photo by: Sean Gardner John McCain: Through the Years SAN DIEGO, CA - MAY 28: (L-R) Republican presidential candidate, former Massachusetts Gov. Mitt Romney, U.S. Sen John McCain and Kim Dang Trang pause after laying wreaths during a Memorial Day Tribute at Veterans Museum & Memorial Center on May 28, 2012 in San Diego, California. U.S. Sen John McCain (R-AZ) joined Mitt Romney at a Memorial Day tribute before heading to Colorado. (Photo by Justin Sullivan/Getty Images)Photo by: Justin Sullivan John McCain: Through the Years ORLANDO, FL - AUGUST 18: Presumptive Republican presidential nominee U.S. Sen. John McCain (R-AZ) speaks during the Veterans of Foreign Wars national convention August 18, 2008 in Orlando, Florida. U.S. Sen. Barack Obama (D-IL) will speak to the same convention Tuesday. (Photo by Matt Stroshane/Getty Images)Photo by: Matt Stroshane John McCain: Through the Years CHULA VISTA, CA - MARCH 24: Republican presidential candidate Sen. John McCain (R-AZ) speaks during a town hall meeting for military families at the VFW Post 2111 March 24, 2008 in Chula Vista, California. Sen. McCain is on a three-day swing through California. (Photo by Sandy Huffaker/Getty Images)Photo by: Sandy Huffaker John McCain: Through the Years SAN DIEGO - JULY 14: Presumptive Republican presidential nominee, Sen. John McCain (R-AZ) speaks to attendees at the National Council of La Raza July 14, 2008 in San Diego, California. The NCLR, which bills itself as the largest Hispanic civil rights and advocacy organization in the U.S., says on its website that it works to improve opportunities for Hispanic Americans. (Photo by Sandy Huffaker/Getty Images)Photo by: Sandy Huffaker John McCain: Through the Years SAN DIEGO - FEBRUARY 5: Republican presidential hopeful Sen. John McCain (R-AZ) (R) speaks as California Gov. Arnold Schwarzenegger (L) and his wife Cindy McCain look on during a campaign appearance at Jim's Air Aviation February 5, 2008 in San Diego, California. McCain is leading in most polls over rival contender former Massachusetts Gov. Mitt Romney on the biggest Super Tuesday in American history. (Photo by Mario Tama/Getty Images)Photo by: Mario Tama John McCain: Through the Years SAN DIEGO - FEBRUARY 5: Republican presidential hopeful Sen. John McCain (R-AZ) (R) greets supporters while wife Cindy looks on during a campaign appearance at Jim's Air Aviation February 5, 2008 in San Diego, California. McCain is leading in most polls over rival contender former Massachusetts Gov. Mitt Romney on the biggest Super Tuesday in American history. (Photo by Mario Tama/Getty Images)Photo by: Mario Tama John McCain: Through the Years SAN DIEGO - FEBRUARY 05: (R-L) Sen. Joe Lieberman (I-CT), Florida Gov. Charlie Crist and Republican presidential candidate and Senator John McCain (R-AZ) sit on the campaign plane before a campaign appearance at Jim's Air Aviation February 5, 2008 in San Diego, California. McCain is leading in most polls over rival contender Mitt Romney on the biggest "Super Tuesday" in American history. (Photo by Mario Tama/Getty Images)Photo by: Mario Tama John McCain: Through the Years SAN DIEGO - FEBRUARY 05: Republican presidential candidate and Senator John McCain (R-AZ) (R) laughs as California Gov. Arnold Schwarzenegger (2nd-L) speaks with Sen. Joe Lieberman (I-CT) (L) and Cindy McCain (C) during a campaign appearance at Jim's Air Aviation February 5, 2008 in San Diego, California. McCain is leading in most polls over rival contender Mitt Romney on the biggest "Super Tuesday" in American history. (Photo by Mario Tama/Getty Images)Photo by: Mario Tama