Citing alarm toward the Republican Party’s widespread embrace of 2020 election conspiracies, a moderate GOP Colorado state senator has switched his affiliation to Democrat, enhancing that party’s prospects to retain its majority in the chamber in the November midterms. Kevin Priola, who represents Adams County in Denver’s suburbs, said in a letter Monday he was horrified by the Jan. 6 insurrection on the U.S. Capitol and had waited in vain for his party to repudiate it as well as former President Donald Trump, who continues to insist that it was stolen. “It never came,” Priola said. “To my dismay, brave...