It turned out to be a "push poll" for a particular issue (which I agree with) where they were trying to identify personal info about myself and sign me up for something.
I suspect this was not an uncommon campaign technique, and it only needed to happen once before ppl stop answering calls from "Gallup".
If you want to support a specific candidate and everything they believe in, that's just fine, but you should feel comfortable saying as much and, if you feel up for it, laying out the reasoning.
I am completely fine admitting voting for Biden, why he isn't my favorite and who I would prefer. I feel zero shame, you shouldn't either.
Just my POV.
I have plenty of beliefs I'm not ashamed of on a personal level, that I think are noble, wholesome, and just, that I sure as fuck don't want my employer knowing.
People are bigots. It's not just bad beliefs that are judged harshly.
There are a lot of communities where you wouldn't be completely fine admitting you vote for Biden. Being allowed to vote for Biden anyway is a good thing, being forced to vote on what your peers voted in is bad.