Even though Castro's candidacy is a long shot, he has already changed the terms of the debate. Castro put Beto O' Rourke, who is also trying to fashion himself as the champion of immigrants, on the defensive on the debate stage for not jumping on board. O'Rourke insisted that Section 1325 was needed to go after human trafficking and drug trafficking. But that makes zero sense given that there are already laws on the books that target those crimes.

Four of Castro's rivals—Sen. Cory Booker of New Jersey, Sen. Elizabeth Warren of Massachusetts, Washington Governor Jay Inslee, and Ohio Rep. Tim Ryan—however, threw in their lot with him on this issue. Indeed, Warren now says she'll go even further and scrap the law that makes repeat illegal entry a felony. (First time illegal entry is currently a misdemeanor.)

Beto is no different from Trump