The major reasons most pre-meds do a science major is...
1) Doing a traditional science major helps knock out a lot of pre-reqs.
2) Doing a traditional science major provides a buffer for your science GPA - I.E. Bio/chem/math majors take so many classes that are incorporated into their science GPA, ergo if you mess up a class or two it may not impact your sGPA as much.
However, being a doc is about more than knowing your biology.
That being said I think it is advantageous to pursue a non-science degree to make yourself a more worldly person.
The hospital environment is shrouded with politics. Pursuing a degree in political science will most certainly improve your ability to navigate said environment.
In terms of workload- If you plan on taking this route, you should definitely complete some upper level bio classes in addition to the already established pre-reqs.
Also, make sure you rock the science classes you take, because you don't have that same buffer that traditional students have.
So you will really have to juggle three sets of classes - General Education Requirements, Pre-Med Requirements + Upper Level Bios, Political Science Major Requirements.
I don't believe that a medical school will frown on you having pursued a non-science major, as long as you keep your GPAs (Science and Cumulative) on fleek.
I have friends who have done philosophy, anthropology, english/journalism, psychology/neuroscience, economics, foreign language degrees and gotten into great schools around the country.
Hope this was helpful, goodluck 👍.