I'm sorry Castro didn't have more chances, and I can see why it would annoy him, or his supporters, that another unviable candidate like Pete Buttigieg is still in and has done better in polls. But I've read articles for years about what a fantastic candidate he would be, how he would surely be President someday (or his brother). He and his brother had their share of powerful connections, and years and years of free media about how wonderful he was. I saw him on the debate stage giving voters the explicit choice to move on from Joe Biden, comments that got heavy media coverage and in some cases, heavy support. Voters had the chance to support him, they just chose not to do so. That's more of a chance than some in the race got.