There are a few reasons why I will not be "expressing" myself at the ballot box come this next election.
Primarily so, because the very process disgusts my sensitivity to the ideals of individual liberty. What I mean is that the gross act in playing a very small part in selecting our next overlord should make every egalitarian cringe- if equal liberty is truly their goal, this could only be realized when there are no masters lording over us any longer.
Secondly, because voting is a farce if you are given extremely limited options and no option for exit. The very concept of choice requires the ability to reject and so long that one cannot "express" this choice at the ballot box the only way to do so is to abstain from beans.
Third, because I think it borders on immorality to play even a minor a role in the perpetuity of the institution of mass enslavement. I won't argue that voting in presidential elections is per se immoral (a violation of rights), after all one may feel inclined to vote for pragmatic and strategic purposes. What I do have is a very strong preference of being averse to any situation through which my participation can be viewed as my lending moral support to such a rights-violating institution.
Some people may question my hostility to democratic institutions- I will not deny this charge. I do not see the logic in being imposed upon and having my liberty infringed by the majoritarian opinion no matter the excuse. Whether or not it is better than the alternative (monarchy, oligarchy, communism) is to limit yourself to of a determination of rulership and to not admit the possibility of self-determination.