Goodbye, Arlen Specter.

It is official. Arlen Specter, who has served as Pennsylvania's senator since 1980, has lost the Democratic nomination to congressman Joe Sestak. This is very significant. Arlen Specter, since switching to the Democratic Party, has received the endorsement of many prominent Democrats. These endorsements include numerous local mayors all the way up to President Barack Obama. Many have been commenting that this proves an endorsement from the White House means absolutely nothing. Indeed, Obama campaigned with Specter earlier this year and many ads have featured his support. The question nobody is asking is: is the White House making the wrong endorsements?

Arlen Specter won the support of the Administration for several reasons. They needed his 60th vote for health care reform at its most critical stages, and knew he would not switch parties without firm White House support. Furthermore the White House clearly does not want to anger him by remaining neutral, as he might change his liberal voting record he has accumulated since his party switch. Finally, Arlen Specter is an old Senate buddy of Obama.

What we do know is, the White House has made a huge miscalculation here. The electorate is clearly frustrated with Arlen Specter and not impressed by his blatant political maneuvering. If the Obama Administration wants the 2010 midterm elections to turn out as an anti-incumbent year rather than an anti-Democrat one they should heed the will of the voters. Joe Sestak polls better against Republican nominee Pat Toomey than does Specter, therefore should have been a natural choice for a WH endorsement.

We will see how this dynamic plays out in the Arkansas Democratic primary currently in progress. More on what's going on in Arkansas later tonight.