TUCSON, Ariz. — Former President Barack Obama on Friday contrasted former President Donald Trump’s character with that of the late Sen. John McCain during a packed rally at the University of Arizona. Obama, who faced off against McCain in his successful bid for the White House in 2008, offered only kind words for his onetime political foe during his Friday remarks on behalf of the Harris-Walz campaign. “Being here in Tucson, I’m thinking about my friend John McCain,” said Obama, speaking to several thousand Arizonans. “I don’t want to overromanticize our relationship,” Obama continued, earning laughter from the crowd. “But...