Sen. Arlen Specter (D-Pa.) and Rep. Joe Sestak (D-Pa.) are in a tweeting frenzy Tuesday as Pennsylvania voters go to the polls for the Democratic Senate primary.

Specter had tweeted 8 times by 1 p.m. ET Tuesday. Sestak had tweeted 11 times.

Both of them are urging people to vote and to get their friends to vote too.

"Call 5 voters today and let them know that election day is TODAY, you can also tell them where they can vote," Specter wrote.

"Call 5 voters during your lunch break," Sestak urged.

And, first thing Tuesday morning, both candidates tweeted messages about the polls being open.

"The polls are open - make sure you get out and vote today," Specter's message said.

Sestak simply wrote: "VOTE."
Polls close in Pennsylvania at 8 p.m. ET. More tweets are sure to come.