Washington » The snows that obliterated Washington last week interfered with many scheduled meetings, but they did not prevent the delivery of one important political message: Take Sarah Palin seriously. Her lengthy Saturday night keynote address to the National Tea Party Convention in Nashville and her debut on the Sunday morning talk show circuit with Fox News' Chris Wallace showed off a public figure at the top of her game -- a politician who knows who she is and how to sell herself. This was not the first time that Palin has impressed me. I gave her high marks for...