Felons and ex-felons, and new immigrants who are not yet citizens, are included in the voting-age population. In approximating voter turnout, the voting age population for a political unit is regularly used as the denominator for the amount of individuals eligible to vote in a given appointment which is this technique has been shown to drop in accuracy when a larger proportion of the voting-age population is unqualified to vote.
One reason some argue that campaign financing should be restricted it is because such a step can protect our democracy from being corrupted by big money. Allowing campaign financiers to spend as much money as they can will result in people with certain interests having control over government