Rep. Joe Sestak (D-Pa.) has the worst attendance record of any Pennsylvania lawmaker, Sen. Arlen Specter (D-Pa.) suggested Monday.

Specter took to Twitter to hit his Democratic primary opponent for having missed 122 votes so far in 2009.

Specter tweeted Monday:

Joe Sestak has now missed 122 votes - that's almost 1 out of every 6 votes in 2009 - and the worst record in PA.

The veteran lawmaker launched his Twitter page in part to wage the primary campaign against Sestak, and has used it now for months to try to take down the Democratic House member a few notches heading into next year's high-profile primary.