Sizing Up the Race for the Presidency

With the presidential primaries just six months away, Clinton continues to lead Obama and Edwards, but Republicans aren't even close to picking a favorite. We talk about candidates, issues and the prospects for change between now and January of next year. Also, Fed Chair Ben Bernanke on sub-prime mortgage rates and, on Reporter's Notebook, after Britain expelled four Russian diplomats, Russia has responded in kind, saying it's now "impossible" to cooperate against terror.