"There are striking differences in amount, content and character of the science cited by partisan policymakers," says Alexander Furnas, a political scientist at Northwestern University in Evanston, Illinois, and a co-author of the analysis, published in Science on 24 April. The researchers used the government-policy database Overton to assemble around 50,000 policy documents produced by US congressional committees in 1995-2021 and around 200,000 reports from 121 ideologically driven US think tanks over a similar period. These documents contained 424,000 scientific references.
A statistical analysis revealed that congressional reports are now more likely to cite science papers than before. But, in each two-year congressional cycle, documents from committees under Democratic control had a higher probability of citing research papers, and the gap between the two parties has increased. Overall, documents from Democratic-controlled committees were nearly 1.8 times more likely to cite science than were reports from Republican-led ones. The differences were starkest for reports produced by partisan think tanks, which the researchers say are "key resources for partisan policymakers." Left-leaning think tanks were 5 times more likely to cite science than right-leaning ones. And there was little overlap between the science referenced by the two sides: just 5-6% of studies were cited by both groups.
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