Simple: Sustain. (if you want to stick with the same suffix)
–verb (used with object)
1. to support, hold, or bear up from below; bear the weight of, as a structure.
2. to bear (a burden, charge, etc.).
3. to undergo, experience, or suffer (injury, loss, etc.); endure without giving way or yielding.
(shamelessly stolen from http://dictionary.reference.com/browse/sustain)
Both words come from the same root... meaning "to hold"... implying to support a vote (either for or against) or in the opposite... like abstain meaning to withhold support of a vote.