While theoretically simple, instant runoff voting often requires computers because the rankings on each ballot matter for determining the elimination order and can not be counted in aggregate. Opponents of Instant runoff voting often oppose computer counting of ballots, since it is difficult for ordinary citizens to count the ballots by hand and catch any fraud. The fact that a candidate has fewer votes does not mean the candidate is less popular but that the candidate was squeezed out on both sides of the political spectrum. Instant runoff voting can eliminate centrists in the last elimination.