David Brady of Stanford University talks with EconTalk host Russ Roberts about American public opinion on changing the health care system. Brady discusses the impact of taxation on public opinion toward health care reform--if the poll includes a measure of the likely increase in taxes necessary to pay for expanding coverage, support for expanding coverage drops dramatically compared to generic polls that ignore costs. He also discusses the role of the party system and partisanship for the health care issue and more generally, how partisanship has changed over time. The conversation concludes with Brady's views on how much science there is in political science.