https://www.pewresearch.org/politics/2021/06/30/behind-biden...
Doctors had amazing voter turn out in 2020.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle...
I couldn't find an analysis of how they actually voted in 2020 but only 26% voted for Trump in 2016 before he bungled the pandemic
https://www.medscape.com/viewarticle/873266
Then there is the fact that a number of doctors think pre-covid trump already was in need of mental health help
https://www.cnn.com/2018/01/13/health/trump-mental-health-ex...
Only 15% supported a repeal of Obamacare heavily promoted by Trump before the worst public health crisis in my lifetime.
https://www.reuters.com/article/us-health-obamacare-doctor-s...
Far from it being half of America it looks like a small fraction of educated folks and minorities and a large helping of mostly uneducated white folks. If anything the fact that he has any support at all from educated people in America proves that being an expert in one field doesn't necessarily make you wise.