A Pew study, released today, shows that GOP party identification has slipped nationwide, but it's important to note that the same is true for the Democratic Party: voters are identifying less with both parties in 2009, while more are claiming themselves as independents. In the last five months, GOP ID has slid from 26 percent to 22 percent, Democratic ID has slid from 39 percent to 33 percent, and independent ID has risen from 30 percent to 39 percent.
See a trend chart after the jump:

So there's no question Specter has defected to the more popular party in his home state (and nationwide), but as Specter found himself uncomfortable as a Republican, many Americans are similarly without a party to call home.
This article available online at:
http://www.theatlantic.com/politics/archive/2009/04/drooping-party-id-is-independent-viagra/16858/
