Representative John F. Tierney and Richard R. Tisei, his Republican challenger, have agreed to debate each other at least twice, the campaigns said Monday.

Tierney, in a press release Monday afternoon, challenged Tisei and libertarian candidate Daniel Fishman to four debates. The candidates are running in a North Shore district.

Tisei followed up later in the afternoon with his own roster of four debates. But only two overlapped with Tierney’s list: a Sept. 27 debate at North Shore Community College in Lynn and an Oct. 10 debate, the location for which has not been chosen, according to the campaign.

Fishman said he was “absolutely going to attend all the debates.”

Tierney’s campaign manager, Matt Robison, said the campaigns were invited to participate in about a dozen debates and that Tierney remained open-minded about reaching mutual agreement on more of them. He said Tierney would attend the four he has agreed to, regardless of what the other candidates do. The first one, which Tisei has not agreed to, is this Thursday in Lynn.

Tisei said he chose his debates with an eye toward representing different regions of the district and would attend each of them, regardless of whether Tierney participates.

GOP objects after tracker
filming Warren is impeded

Republicans reacted angrily Monday after a video tracker was apparently pushed, threatened, and had his camera knocked down while shooting video of Democratic US Senate candidate Elizabeth Warren.

The Warren campaign said the man involved was a private cabdriver, unaffiliated with the campaign.

The hand-held video, shot by a Republican campaign tracker on Sunday on Martha’s Vineyard, shows Warren getting into a car. The vehicle’s driver then tells the tracker, “Get out of my face or I’m going to call the police.”

The photographer protests, saying several times that it is a “public event,” as the driver shouts back, “Get out of my face.”

At one point, the camera appears to fall to the ground and the photographer appears to get shoved. “You’re messing with the wrong people,” the driver says at the end.

Trackers attend and record campaign events held by candidates, hoping to capture details on the opposition that media coverage would not provide.

Nate Little, executive director of the Massachusetts Republican Party, called the driver “a campaign aide” in a statement demanding an apology from Warren. “In addition to knocking the camera from the employee’s hand, the individual also threw a punch,” the statement said. “This type of behavior is completely unacceptable and has no place in our public discourse. Despite witnessing this assault firsthand, Professor Warren took no action and allowed it to continue.”

The video, however, does not make clear that Warren, who was in the car during the confrontation, was aware of it.

The Warren campaign, which is challenging Republican US Senator Scott Brown, responded with a statement from spokeswoman Julie Edwards.

“The person featured in the video was not a member of the Elizabeth Warren for Massachusetts staff,” she said. “He is a cabdriver. Elizabeth did not see what happened. The photographer has a right to film in public locations, and the campaign had allowed him to film the entirety of Elizabeth’s event. The confrontation was wrong.”

The state Democratic Party also released a video from a March event at a VFW in Revere in which one of their trackers was forcibly removed.