Definitely. I pretty much keep silent on political/social issues online these days. It's just not worth the risk of being targeted for personal/professional destruction by the internet social outrage machine (Fortunately, we still have secret ballots here in the US, so at least some form of political speech can be engaged in safely).
Sort of, political parties have profiles for most voters based on their public profiles etc, they compile all info and predict your stand on various issues and when those databases leak..... and they do: https://www.upguard.com/breaches/the-rnc-files you are no longer protected, your best bet is to not have public facing anything at this point in time
