Must every cable channel bring us convention coverage from a jam-packed restaurant? What’s the thinking here? “Authentic” backdrop complete with “Real People” (and fries)? I can barely hear Joe Scarborough — no low-talker, he — with all the background noise and bustling at Sam’s No. 3 Bar and Grill in Denver from whence Morning Joe will be broadcast all week. How loud can it get? Terry McAuliffe — Terry McAuliffe! — was practically inaudible just now.