[dropcap]T[/dropcap]he decision by San Antonio Democratic U.S. Rep. Joaquín Castro to stay out of the 2018 race for the U.S. Senate is a wise one, for him, for the Democratic Party, for the state – and for the nation.

Castro would have probably lost his party’s nomination to El Paso Congressman Beto O’Rourke, who is generating plenty of excitement among Texas Democrats eager for a fresh new face and voice, one who stands outside the traditional politician mold.

We don’t kn...