You know how you can tell who the Democrats are grooming for future greatness? They’re the one assigned the honor of delivering the convention’s keynote speech, set for prime time tonight. And this year, the fair haired boy is San Antonio mayor Julian Castro. Whoa! A Texas mayor? That’s good news (gun-wise), right? Not so fast, Sparky. Julian’s a made MAIG member. For you cave-dwellers, that’s Michael Bloomberg’s anti-2A agglomeration of (mostly) lefty gun-grabbing mayors. Texas’s preemption law is likely the only thing that’s prevented Castro from pushing more restrictive gun control laws down Alamo way. And Second Amendment Foundation honcho Alan Gottlieb tells TTAG that Castro’s no friend of firearms. That’s good enough for us. You?