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“We are really busy in New Jersey, and after a fast-paced several months people took some vacations,” Christie spokesman Mike Drewniak said Monday. “There will be a place for that late in the summer or fall.”

Meanwhile, Mr. Brown, has held events for Mr. McCain, Rep. Rob Wittman of Virginia and Rhode Island state Rep. John Loughlin, who is trying to capture the seat held by retiring Rep. Patrick Kennedy, a Democrat.

The trio also will be involved in the competitive congressional races in their home states. That likely that translates into as many as four tight races in Virginia, one tight race in Massachusetts and one tight race in New Jersey, political observers say.

But it will be the races beyond their state boundaries that likely will determine their place in the party.

Wayne Lesperance, a political science professor at New England College in Henniker, N.H., said the four Republican candidates running for the U.S. Senate seat vacated by Judd Gregg have stolen a page out of Brown’s playbook by casting themselves the “everyman or everywoman.”

“The symbols that Scott Brown used to depict the outsider, the pickup truck, the barn coat. They are using in the sense to communicate the same message,” he said.