Media buyers engage with intermediaries known as ad networks, which algorithmically place ads across the multitude of sites in their networks, leaving advertisers unaware of where these ads actually end up. These advertisers need to take their share of responsibility for the health of our democracy and stop supporting outlets that are well-documented disinformation purveyors. Advertisers have tremendous power to push our media ecosystem back in the right direction, to help correct this market failure in the marketplace of ideas by avoiding outlets that peddle lies.