¡Ay caramba! Imagine the cries of offensive ethnic stereotyping or worse if Fox News had observed Cinco de Mayo by having one of its yanqui persons of pallor staggering across the set in a sombrero while chugging from a pint bottle of tequila? But it happened on MSNBC, so the PC police probably won't make a peep about it. At the today's transition from Way Too Early to Morning Joe, there was producer Louis Burgdorf with his Halloween-store sombrero and pint bottle. Way Too Early host Thomas Roberts encouraged Burgdorf "to drink the whole thing and eat the worm," meaning...