The trophy president: President Obama teaches “Politics 101”—“You don’t put stuff on your head if you’re president”—to the Navy football team during their White House visit to collect the Commander in Chief’s Trophy. April 12, 2013. (AP Photo/Susan Walsh)

The advance man, then (above) and now (below): Matt Bennett, with Bill Clinton’s trip director, Wendy Smith, in Lansing, Michigan, in 1992 and in Washington, D.C., in 2015. (Photos/Collections of Josh King and Matt Bennett)

Sitting pretty: Arthur Grace’s photograph in his 1989 book, Choose Me. A rarely seen photo depicts Dukakis on the M1A1 as his advance team wanted the day in Sterling Heights to play out—a commanding (helmetless) leader. September 13, 1988. (Photo/Arthur Grace)

The money shot: Going off script, the tank commander approaches the press riser, teeth bared, the M1A1’s machine gun trained on the media, “Mike Dukakis” stenciled across his helmet. September 13, 1988. (AP Photo/Michael E. Samojeden)

Before: Dukakis and Gordon England of General Dynamics in jump suits designed for extraction in case of emergency, surrounded by the campaign entourage en route to their tank ride. September 13, 1988. (Photo/Collection of Gordon England)

After: Dukakis descends a portable ladder from the M1A1’s turret inside the hangar at General Dynamics Land Systems at the conclusion of his high-speed tank ride. September 13, 1988. (Photo/Arthur Grace)

Paying for groceries: President George H. W. Bush with an apple, a quart of milk, and light bulbs at the NCR point-of-sale exhibit at the National Grocers’ Association annual convention in Orlando, Florida. February 4, 1992. (AP Photo/Barry Thumma)

Taking the plunge: Senator Robert Dole grimaces as his head is cradled in the hands of AFP photographer David Ake after falling from the stage in Chico, California. Ake didn’t get the shot; Rick Wilking did. September 18, 1996. (Reuters Photo/Rick Wilking)

Summer cruise: Vice President Al Gore and New Hampshire governor Jeanne Shaheen paddle down the Connecticut River on July 22, 1999. A dam’s floodgates were opened upstream to raise the river’s water level. July 22, 1999. (AP Photo/Toby Talbot)

Tacking: Senator John Kerry windsurfs off Nantucket on August 30, 2004. Grainy video of the sojourn became the backdrop for “Windsurfing,” a political ad from the Bush-Cheney campaign. (AP Photo/Laura Rauch)

The green screen: Senator John McCain speaks before a new green backdrop in Kenner, Louisiana, on June 3, 2008. The Colbert Report converted the video into a chroma-key composite that allowed viewers to insert new, creative backdrops. (AP Photo/Bill Haber)

Vanilla walls: Two weeks into President Obama’s first term, official photographer Pete Souza snapped his boss on the phone in his private study off the Oval Office. The shot was included in Souza’s “First 100 Days” Flickr album. February 3, 2009. (White House Photo/Pete Souza)

Obama and the batsman: It wasn’t the “Field of Dreams” moment I envisioned, but cricket legend Brian Lara still taught President Obama a thing or two about keeping his eye on the ball at the Marriott in Port of Spain, Trinidad. April 19, 2009. (White House Photo/Pete Souza)

The Beer Summit: President Obama, Harvard professor Henry Louis Gates Jr. and Cambridge police sergeant James Crowley bury the hatchet over a brew in the White House Rose Garden. July 30, 2009. (White House Photo/Pete Souza)

Oval briefing: The author with President Clinton, Chief of Staff Leon Panetta, and Housing Secretary Henry Cisneros before an event in the White House Rose Garden. June 6, 1996. (White House Photo/Bob McNeeley)

Fly on the wall: The author, far left, with pool photographers shooting through the glass of the Oval Office as President Clinton worked on a speech. November 17, 1993. (White House Photo/Bob McNeeley)

Best laid plans: The author, far right, with French and American officials inspecting scale models for the 50th Anniversary of D-Day in Normandy, France. March 9, 1994. (White House Photo/Bob McNeeley)

Flying high: The author with advance mentor and Hollywood producer Mort Engelberg in the staff conference room aboard Air Force One. April 9, 1995. (White House Photo/Bob McNeeley)

Last day in office: The author and President Clinton, with the crowd behind them in Room 450 of the Eisenhower Executive Office Building, in a pose that Clinton would regularly strike at rallies at the author’s request. December 9, 1997. (White House Photo/Bob McNeeley)