Why does pap not vote in Huckleberry Finn?

Pap is upset by the government for multiple reasons. One, they try to take Huck away from Pap when Huck can finally do "suthin' for him", mainly earn drinking money for pap. Two, Pap is racist against an educated free black who Pap believes acts like he is better than him, because "he wouldn't 'a' give me the road if I hadn't shoved him out o' the way."