Well, I guess if that's been going on for decades at least it's a vote that can be safely discounted. Also no, it won't make a difference. At least not in the US. The math of it is demonstrably that it won't make a difference, especialy if you do it repeatedly. As the guy above said, you change the system so that it makes a difference first (which you may or may not get to via voting) and THEN it'll make a difference. Until then it's just performative absenteeism. Unless you are not in the US and instead live in a parlamentarian proportional system, in which case carry on.