This week’s agenda: Specter vs. Sestak; state primaries take center stage

Key primary races in Kentucky, Arkansas and Pennsylvania may serve to illustrate whether anti-incumbent sentiment is changing the political winds.

In Pennsylvania, Republican-turned-Democrat Sen. Arlen Specter faces a tough primary race against Rep. Joe Stesak. In Arkansas, Democratic Sen. Blanche Lincoln is facing a challege from the Left in a heated battle with Lt. Gov. Bill Hatler. And in Kentucky’s Senate race, Ron Paul’s son, Rand, tries to prove that the Tea Party is part of the new mainstream. New York Times associate national editor, Marcus Mabry, and Charlie Herman, economics editor for The Takeaway and WNYC join us.

We’re looking at the news agenda for the week and asking, What’s the one thing that will define YOUR week? What word defines your next seven days? Let us know in the comments.