Biden at the moment, however Pete has released internals saying he is in second with more reporting than the official counts
Edit: Here they are
Pete Buttigieg Official Website
The official website of former Mayor Pete Buttigieg.peteforamerica.com
Yeah... this has Pete 20% Biden 18% with 26% reporting, but official results show Biden 24% Pete 14% with 23% reporting. Not that I doubt Pete's numbers, but... perhaps they're looking entirely different districts?