As a lifelong Democrat, I have a mental picture these days of my president, smiling broadly, at the wheel of a speeding convertible. His passengers are Democratic elected officials and candidates. Ahead of them, concealed by a bend in the road, is a concrete barrier. They didn't have to take that route. Other Democratic presidents have won bipartisan support for proposals as liberal in their time as some of Mr. Obama's are now. Why does this administration seem so determined to head toward a potential crash and burn?