“The Big Enchilada!” That's how a spokesman for Rep. Sheila Jackson Lee described the endorsement that came the Democratic congresswoman's way Saturday afternoon. No, it wasn't from a senator or labor union, as important as those endorsements may be to the incumbent from the 18th Congressional district. This one, it turns out, was the biggest enchilada. “Congresswoman Sheila Jackson Lee is a tireless champion for Houston's working families,” President Barack Obama said in a statement released by the Jackson Lee campaign. “That's why we need her back in Congress to help my efforts to bring real jobs back to Houston...