In Arkansas, Sen. Blanche Lincoln is leading Lt. Gov. Bill Halter by double digits in polls, as unions and progressive groups have spent millions to support Halter's bid.
In Pennsylvania, Sen. Arlen Specter--who gave Democrats their short-lived 60-seat Senate majority just 13 months ago--has the support of the DC Democratic establishment as he faces a challenge from Rep. Joe Sestak that's too close to call according to surveys released this week.
Here's the latest polling on those two races, from Pollster.com:
http://www.theatlantic.com/politics/archive/2010/05/polling-snapshot-democratic-primaries-in-pennsylvania-arkansas/56596/
This article available online at:
http://www.theatlantic.com/politics/archive/2010/05/polling-snapshot-democratic-primaries-in-pennsylvania-arkansas/56596/
