Rep. Patrick Kenendy (D-R.I.) -- the son of the late Sen. Ted Kennedy (D-Mass.) -- on Frioday made a campaign plea for the Democrat running to replace his father.

The younger Kennedy sent out a fundraising e-mail on behalf of state Attorney General Martha Coakley, who is up against a tough challenge from state Sen. Scott Brown (R-Mass.) The special election will be held Tuesday.

"I want to ask for your personal help in the Special Election for my father's seat taking place in just 4 days," Kennedy wrote the message.The latest polls show Democrat Martha Coakley in the lead, but her Republican opponent is right on her heels in a race that represents the critical 60th vote for health insurance reform and the rest of President Obama's agenda."

Brown on Friday took his first polling lead once thought of as an automatic win for Democrats. 

Kennedy's e-mail was circulated by the Democratic Congressional Campaign Committee (DCCC).

The widow of the late senator, Vicki Reggie Kennedy, cut a television ad for Coakley that aired Friday.