Saturday morning, from 10 a.m. to 12 noon Eastern, join Politics Nation on XM Radio's POTUS '08, when we'll tackle the week in politics. Listen free here (link about half-way down the page) as:

-- Hillary Clinton will drop her presidential bid on Saturday. Where did the once-immovable object go wrong? Was the foundation cracked, or was the unstoppable force of Obama just too much? Plus, it's our last "Where in the world is Mike Memoli," for now at least.

-- Virginia's Eleventh District is a prime example of an emerging Democratic constituency, where suburban voters dominate. Can the GOP hold Rep. Tom Davis's seat? We talk to candidates Gerry Connolly (D), Leslie Byrne (D) and Keith Fimian (R) about their prospects for winning.

-- And the Republican Party is really suffering. It goes beyond the brand, some say, to the very message the party is using. We talk to Ramesh Ponnuru, Rep. Thad McCotter and South Carolina Republican chairman Katon Dawson about the direction Republicans have to head to regain their majority.

All that and a few surprises, we're sure, Saturday morning on Politics Nation, only on XM Radio's POTUS '08. Listen live, Saturday from 10 a.m. to noon Eastern and again at 6:00 p.m. Eastern.