Some kind of Poll bot like Locotes suggested, but I think the word poll works alot better than vote though.
One poll can be active at a time, as you create polls, they are automatically assigned numbers, like the Quote bot numbers your quotes.
.poll create <Question> <time to vote>
(Time to vote defaults to 7 days if not specified)
.poll option1 <option 1>
.poll option2 <option 2>
(adds the options to the currently open poll, up to option10)
.poll view <poll number>
(can be used to look at past polls)
.poll results <poll number>
(lists the number of votes for each option)
.poll delete <poll number>
(deletes the poll completely)
.poll
(lists the currently active poll's question and answer choices, with their option numbers)
.vote <option number>
(casts your vote for the option number)
.poll history
(lists all the past polls' questions with their poll number next to them)