Voting is a right, but not an unconstrained one. The right to vote is not granted to those under the age of eighteen. That age limitation shows that voting rights may be restricted when there is reason to doubt the potential voter’s good judgment. Resident aliens are excluded from voting on the grounds that their interests are not necessarily coincident with the interests of ordinary citizens. Convicted felons are another class of citizens whose judgment is reasonably called into question. The interests of convicted felons are likely to be contrary to the interests of citizens as a whole, who want to be protected from criminals.