...is courtesy of Paul Krugman. In regard to Paul Ryan's plan to "reform" Medicare by issuing vouchers to everyone currently under the age of 55 (my emphasis):
Beyond that, the promise of unchanged benefits for Americans of a certain age just isn’t credible. Think about the political dynamics that would arise once someone born in 1956 still received full Medicare while someone born in 1959 couldn’t afford decent coverage. Do you really think that would be a stable situation? For sure, it would unleash political warfare between the cohorts — and the odds are high that older cohorts would soon find their alleged guarantees snatched away.