Statement by Senator Arlen Specter  —  I have been a Republican since 1966.  I have been working extremely hard for the Party, for its candidates and for the ideals of a Republican Party whose tent is big enough to welcome diverse points of view.  While I have been comfortable being a Republican, my Party has not defined who I am.

Two Republicans blame conservatives  —  Two leading Republicans say Sen. Arlen Specter's decision to become a Democrat highlights the hostility moderates feel from an increasingly conservative GOP.  —  “You haven't certainly heard warm encouraging words about how [the GOP] views moderates …

Unprincipled Hack (D-PA)  —  When a politician switches parties, it's customary for the party he's abandoned to denounce him as an unprincipled hack, and the party he's joined to praise him as a brave convert who's genuinely seen the light.  But I think it's pretty clear that Specter is an unprincipled hack.

Veteran GOP Sen. Specter becomes Democrat  —  WASHINGTON (CNN) — Veteran Pennsylvania Sen. Arlen Specter switched from the Republican to the Democratic Party on Tuesday, saying he has found himself increasingly “at odds with the Republican philosophy.”  —  “This is a painful decision.

Specter Switches Parties  —  Senator Arlen Specter of Pennsylvania said on Tuesday he would switch to the Democratic party, presenting Democrats with a possible 60th vote and the power to break Senate filibusters as they try to advance the Obama administration's new agenda.

Snowe: GOP Has Abandoned Principles; Specter Switch “Devastating”  —  Sen. Olympia Snowe of Maine, one of the few remaining moderate Republicans in the Senate, said Tuesday that Arlen Specter's abandonment of the GOP is “devastating,” both “personally and I think for the party.”

Another Triumph for the Club for Growth  —  With Arlen Specter's defection, all that stands between the Democrats and a 60-seat Senate majority are Norman Coleman's lawyers.  I wish them every success - but they have not exactly been on an winning streak to date.

CNN's Rick Sanchez calls out DeMint's vapid talking point: ‘What the hell does that mean?’  —  Today, Sen. Jim DeMint (R-SC) appeared on CNN to talk about Sen. Arlen Specter's switch to the Democratic party.  Host Rick Sanchez asked DeMint about Specter's statement that the Republican party …

Specter switching parties  —  A source involved in the talks confirms that Senator Arlen Specter will switch to the Democratic Party, a dramatic move putting the Democrats within reach of two votes in the Senate.  —  The move stands to put the White House's agenda on a fast-track …

What Specter's switch says about him, the Democrats and our political spectrum  —  (updated below - Update II)  —  I just contributed my thoughts on Arlen Specter's party switch to the New York Times' “Room for Debate” segment, so I'll post the link to that once that is available (see Update II) …