Just over a year ago, David Hogg, then the newly-minted vice chair of the Democratic National Committee, found himself unceremoniously pushed out after he called on the party to back primary challengers to unseat members of a moribund establishment.

Now, as progressives notch victory after victory against the party’s conservative old guard and are once again galvanizing young voters thought to have been lost, the 26-year-old reformer says it proves he was right all along.