Sen. Arlen Specter's (R-Pa.) office pushed back hard against primary opponent Pat Toomey's announcement today, accusing Toomey of having "cannibalized" the Republican Party.

Specter said Toomey, in his work as chairman of the conservative Club for Growth, was the Democrats' "Most Valuable Player," copping a sports analogy, for having contributed to the defeat of centrist Republicans in Congress.

Specter tweeted Wednesday:
Pat Toomey, the Democrats' MVP. How Toomey cannibalized the GOP:

The link follows through to a page on Specter's Facebook profile, in which Toomey is blasted for contributing to the defeats of Sen. Lincoln Chafee (R-R.I.), Rep. Ric Keller (R-Fla.), Rep. Wayne Gilchrest (R-Md.), Rep. Tim Walberg (R-Mich.), Rep. Bill Sali (R-Idaho), and Rep. Heather Wilson (R-N.M.).

The tweet represents a consistently aggressive but particularly harsh line of attack from Specter, who has sought to get out in front of the sure to be hotly-contested primary battle.

Cross-posted at the Briefing Room.