Hi Shuning,
Going from names to ORCIDs is hard -- so many people have the same name and then it is hard to know which ORCID to use. Using the fact that you know they are in Political Science can help.
You might want to try using OpenAlex dataset for this (
https://openalex.org, just came out a few weeks ago) because we've done some disambiguation to make it easier.
Three ways I can think of to get at the data you are looking for:
1. If the you have papers for the people you are looking for, call the api using the DOI -- the authors will be there along with their ORCID when we know it.
Needless to say we at OpenAlex are huge fans of ORCID data and API and snapshot! We couldn't include their data in OpenAlex without all their hard work and CC0 data :) But fyi these are some other query paths into the data in case they help.
Heather