Speaking at a rally in Cleveland with Acton and former senator Sherrod Brown, Obama said the ad, which features Acton's estranged birth mother questioning her character, showed a breakdown in standards for public officials.
"In recent days, we've seen there is no line he will not cross, no low he will not sink to," Obama said of Ramaswamy. Noting that Acton has "spoken movingly about her painful childhood and all she's experienced: abuse, neglect and homelessness," he added: "There's a decency we should expect out of our public officials."
The Ramaswamy campaign video features Acton's birth mother, Donna Arthur, calling her "a liar" and insinuating she has mental health issues. Acton, Ohio's COVID-19-era health director, has spoken publicly about facing homelessness and abuse as a child.
Acton, appearing before Obama, addressed Ramaswamy directly. "My opponent has chosen to exploit, intentionally, my childhood to save his stumbling campaign, but it's not going to work," she said. "Decency still matters."
Ramaswamy has defended the ad as fair game. President Donald Trump, voting in West Palm Beach on Saturday, also defended it. "This is a disgrace," Trump said. "The mother said that Amy Acton is a liar and she's no good. And you know what? I don't think you can get a better reference on that." Republican leaders across Ohio, including Governor Mike DeWine, have called for the ad to be removed.
The rally was part of a broader Democratic push in midwestern battlegrounds. Obama was scheduled to campaign in Detroit later Saturday for Abdul El-Sayed, who is running for Senate against former representative Mike Rogers, and will headline a rally in Georgia next week alongside Senator Jon Ossoff and gubernatorial candidate Keisha Lance Bottoms. Trump was set to speak in Georgia on Saturday.
Obama also criticized Trump for not lowering costs, saying the president had instead focused on building a new White House ballroom and helipad. "I don't know if you've noticed, but he seems very focused on home renovation," he quipped. "He should be on HGTV."
Obama acknowledged that Trump remains in office for another two years, but argued voters are not stuck with his allies. "We're not stuck with a spineless Congress and Republican governors who are handling lawlessness and carelessness and cruelty and indifference for working people," he said.