I find the choice of "14 year olds" quite fascinating, because 14 year olds don't have voting rights. If 14 is replaced with 18, then suddenly the phrase takes a completely different tone, since then it'd be disenfranchising a block of the population that has legitimate voting rights.

I feel that 14 was chosen deliberately to give teh additional implication that CISPA opponents "don't have the right to oppose it" or something along those lines.