This week on Politics Nation, live on Saturday mornings on XM Radio's POTUS '08, we chat with prominent Washington journalists about their thoughts on important, and overlooked, turning points in the Democratic primary battle. Guest host Tim Sahd and this writer interview CongressDaily's Erin McPike, The Hill's Sam Youngman and the Associated Press' Phil Elliott in the first hour:

And in the second hour, we take a look ahead to this Fall's likely matchup between John McCain and Barack Obama. The two candidates have said they can expand their party's electoral map. Is it true, and if so, what states are newly in play? Hear McCain campaign manager Rick Davis and Obama national co-chair Eric Holder's take on the November battleground:

Be sure to tune in this Saturday, from 10 a.m. to noon Eastern and replayed from 6 p.m. to 8 p.m. Eastern, on XM Radio's POTUS '08 for Politics Nation, live from the nation's capitol. You can find the listen free link, along with a preview of the show, in this space every Friday afternoon.