… is from David Von Drehle’s most-recent Washington Post column, titled “Democrats refuse to be the only ones limited by reality ” (links original):
Socialism. It is to politics as New Year’s resolutions are to waistlines. No matter how reliably it fails, believers insist it will work next time. Sweden can swear off  fad diets. Zimbabwe  can flop like a week-old ThighMaster . There will always be socialists to insist they just need another shot.