After Vice President Kamala Harris announced Minnesota Gov. Tim Walz as her presidential running mate, it didn’t former President Donald Trump and Sen. J.D. Vance (R-Ohio) long to start attacking him. And one of Vance’s lines of attack is claiming, with zero evidence, that Walz is distorting and exaggerating his military record. In an August 8 column, MSNBC’s Steve Benen debunks MAGA claims about Walz’s military service and argues that Republicans are trying to “swift-boat” Walz in much the same way that Democratic presidential nominee John Kerry was “swift-boated” by President George W. Bush’…