Voting is absolutely an obligation for any democratic society. Abstaining provides no kind of signal or message to the body politic.
> Abstaining provides no kind of signal or message to the body politic.
This is true and irrelevant. Not wanting to spend the (rounding up) 10 seconds to glance at and fill out the Presidential portion of a ballot nor waste the ink from your pen to do so before dropping it in the post simply because you do not like any of the viable candidates enough to do so (or for any other reason) is a personal affair.
In the same way that not helping at the scene of an automobile accident is a personal affair, I suppose, yes.
Just not in this reality.