Romney traveled to Bernardsville, N.J., for the $5,000-per-plate dinner, where about 80 supporters showed up.

A close friend and ally of Gov. Chris Christie (R-N.J.), another Romney backer, Kyrillos is running to unseat Sen. Robert MenendezRobert (Bob) MenendezSchumer: Obama 'very amenable' to helping Senate Dems in midterms The Hill's Morning Report: Can Trump close the deal with North Korea? Senate must save itself by confirming Mike Pompeo MORE (D-N.J.), who is seeking his second term in the Senate.

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Christie has been fundraising for Kyrillos, too, but Menendez has a more than 4-to-1 advantage over Kyrillos in cash on hand.