Specter says party switch driven partly by desire to keep seat - CNN.com
Arlen Specter Loses Pennsylvania Democratic Senate Primary to Joe Sestak - CBS News
Former U.S. Senator Arlen Specter, long a moderate Republican who switched to the Democratic party in 2009, represented Pennsylvania from 1981-2011. Along the way he became a dominant force in the Judiciary
Arlen Specter, Senator Who Gave No Quarter, Dies : NPR
What does Specter's party switch mean for climate and energy? | Grist
Arlen Specter: A One of a Kind Senator
Former Sen. Arlen Specter dies at 82
Specter is 13th senator to switch since 1913 - CNN.com
After Party Switch, a Senator's Confused Alliances - The New York Times
Pa.'s Specter: Cancer and political survivor - The San Diego Union-Tribune
Senator Specter Announcement on Party Switch | C-SPAN.org
Arlen Specter, Senator Who Gave No Quarter, Dies | WAMU
Pennsylvania senator Arlen Specter switches party to become Democrat | US Congress | The Guardian
Analysis: Specter leaves a shrinking GOP tent - The San Diego Union-Tribune
Analysis: Arlen Specter spent his career skillfully playing both sides of the corridors of power - pennlive.com
Pennsylvania senator Arlen Specter switches party to become Democrat | US Congress | The Guardian
Specter switching parties
Senator Specter Announcement on Party Switch | C-SPAN.org
Why Pennsylvania Senator Arlen Specter Switched Parties - TIME
Members of Congress Who Switched Parties -- Photos - WSJ
Biomedical Research Loses Long-Time Ally With Death of Arlen Specter | Science | AAAS
GOP Sen. Arlen Specter Switches Parties, Joins the Democrats - WSJ
Specter's party switch is more about Specter – The Mercury
Arlen Specter dies at 82 | WJLA
