In 2004, Tim Walz organized a protest outside a rally for President George W. Bush where he held up a sign that read “Operation Enduring Freedom Veteran 4 Kerry” — referencing the US fight against terrorists in Afghanistan. The trouble is, in his 24 years in the Minnesota National Guard, Walz never deployed to combat zones in Afghanistan or Iraq. The closest he got was thousands of miles away in Italy. But it’s a label he used again and again — including in his official biography when he ran for Congress two years later in 2006. That photo shows just...