Barack and Michelle Obama surprised many viewers by going after Donald Trump in their convention speeches. The former first lady famously declared at the 2016 Democratic National Convention that, “When they go low, we go high,” but she and the former president took direct aim at the Republican nominee’s character flaws, antidemocratic tendencies, and even his sexual insecurities rather than focus on rallying the Obama coalition around Kamala Harris. “I think in some ways what Barack Obama was doing last night, and Michelle Obama, were doing last night, though, kind of undermining some of Trump…