Universal health care wasn't as popular back then as it is now, so that's to be expected:

https://news.gallup.com/poll/4708/healthcare-system.aspx

This isn't about who wins campaigns -- this is about who influences the issues they campaign on. Since the Citizens United decision politicians have had to switch to the Super PAC model to be competitive, which gives drastically more power to dark money donors. And unsurprisingly, as cited in that study, the influence of average citizens on politics has been completely surpassed by businesses and economic elites:

https://www.cambridge.org/core/journals/perspectives-on-poli...