Joseph Kennedy III walks toward the Newton Center Green Line...

Joseph Kennedy III walks toward the Newton Center Green Line MBTA Station, in Newton, Mass., to greet commuters. Kennedy, the grandson of late Robert F. Kennedy, launched his campaign for the Massachusetts congressional seat now held by retiring U.S. Rep. Barney Frank. (Feb. 16, 2012) Credit: AP

Joseph Kennedy III has launched his campaign for the Massachusetts congressional seat now held by retiring U.S. Rep. Barney Frank.

Kennedy released a video announcement on his website Thursday before heading out on a campaign swing through the 4th Congressional District.

Kennedy started by greeting commuters at the Newton Center MBTA Station and talking to customers at a nearby diner. He is scheduled to make stops later in Milford, Attleboro, Taunton and Westport.

Kennedy is the son of former U.S. Rep. Joseph Kennedy II and a grandson of the late Robert F. Kennedy.

He told commuters he's proud of his family's legacy, but knows he has to earn voter support. He cited his late great-uncle Sen. Edward M. Kennedy as an example of how to reach across the aisle.

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