Politico reported last month that Matthews, who has hosted "Hardball" since 1997, had been participating in strategy meetings ahead of his wife's campaign announcement. At the time, an MSNBC spokesperson told Politico that Matthews was providing "the support that any spouse naturally would."
Matthews made it clear Wednesday that he has every intention to help his wife get elected, saying he will "offer Kathleen whatever help I can, including giving her any advice that might be useful."
Some might be uncomfortable with a cable news host -- even one as overtly partisan as Matthews -- moonlighting as a consultant.
"As a journalist, I also know how important it is to respect certain boundaries in my support for her both in my public role and here on MSNBC," Matthews said. "And while most of you know our show doesn't typically cover congressional races, I will continue to fully disclose my relationship with her as part of MSNBC's commitment to being transparent and fair in our coverage."
He added: "I love Kathleen and I am so proud of her and enthusiastically support her answering the call to public service."