You can go vote and write in 'Lady Gaga' or something. The important part is that you getup and go "vote", to signal that you care.
Otherwise, politicians won't be able to tell whether you are dissatisfied or just uninterested. If you are explicitly dissatisfied, they might try to do something to get your vote. Hopefully by enacting good policy.
https://www.youtube.com/watch?v=xIraCchPDhk&feature=youtu.be...