evidence: Biden, Trump’s presumptive Democratic challenger, has similarly seized on Trump’s remarks, calling his hydroxychloroquine advocacy "totally irresponsible" after the president announced he was taking the drug as a preventive measure. Democrats have also used the hydroxychloroquine controversy as a chance to attack Republicans for accepting campaign contributions from the pharmaceutical industry, which faces record-low popularity after years of attacks from politicians in both parties over high drug prices. [...] But it’s not clear whether voters will penalize politicians for picking the other side. Whit Ayres, the president of the GOP-aligned polling firm North Star Opinion Research, cautioned that hydroxychloroquine might be "but a distant memory" come Election Day.