Sen. Byron Dorgan (D-ND) is retiring

Byron Dorgan isn't running for re-election this year. That will be a tough seat for Democrats to hold.

Dorgan has been in the news recently because he led the effort to end the ban on drug imports in the Senate insurance bill. But, his amendment was defeated because the White House lobbied against it (even though Obama supported that same legislation as a Senator and a candidate.) But the Obama administration flipped on this drug issue because Obama's top staffers cut a sweetheart deal with the drug industry's lobbying arm.