I’ve watched a lot of presidential campaigns, and I can’t remember one in which the contest for the Democratic vice-presidential nomination has played out quite so publicly. One breakthrough voice has been Gov. Tim Walz of Minnesota. Before last week, he didn’t have much of a national profile. But then he went on “Morning Joe” and said of Donald Trump and JD Vance, “These guys are just weird.” That one line has transformed the Democratic Party’s messaging, with everyone from Vice President Kamala Harris to Senator Joe Manchin using similar language. But it’s the kind of criticism that risks coming off as condescending to those who support Trump and Vance, similar to Hillary Clinton’s “deplorables” comment in 2016. But what has stood out to me about Walz’s political ethos is his confidence in speaking on behalf of everyday Americans — a confidence his track record backs up. Walz comes from a very small town and repeatedly won House races in a district that heavily favored Trump. ...