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A Contest has 3 phases, Entry, Voting, and Complete. You can set the dates when the Entry begins, when the Voting begins (which means the Entry Ends), and when the contest is Complete. This is the most fair way to run a contest because this means each entry will have the same amount of vote time. Optionally you can allow Entries while the Voting is occurring, but this is not the most fair way to run a contest.
Who do you think is going to win the Democratic Primary for President
Even better, who do you think is going to beat this guy?