A dark money group funded by drugmakers launched ads promoting Senator Kyrsten Sinema just before the Arizona Democrat informed the White House that she opposes the party’s plan to lower prescription drug prices as part of President Joe Biden’s $3.5 trillion infrastructure reconciliation package. Sinema’s threat to kill the legislation came despite a recent poll showing more than 80 percent of Arizonans support the Democrats’ proposal.

During her career, Sinema has raked in more than $500,000 from donors in the pharmaceutical and health products industries — and she is now the sixth largest Senate Democratic recipient of campaign cash from those industries this election cycle, according to data compiled by OpenSecrets.

Democrats’ drug pricing measure is based on H.R. 3, the Elijah E. Cummings Lower Drug Costs Now Act. It would allow Medicare to use its bulk purchasing power to negotiate lower prescription drug prices. H.R. 3 would save the government $456 billion over ten years and “reduce prices by 57 percent to 75 percent, relative to current prices” for various medicines, according to the Congressional Budget Office.