MSNBC has taken out a full-page ad in the Boston Globe, declaring yet again that host Rachel Maddow has no interest in running against Sen. Scott Brown (R-Mass.).

Brown used the possibility of Maddow challenging him in a fundraising e-mail, and Maddow hasn't been happy about it.

In the full-page ad, Maddow reiterates that the rumor is completely unfounded and takes a shot at Brown's credibility.

"I'm running this ad not because I'm running against Scott Brown — I'm not, he made that up — but because he's the senator for all of us, and maybe this will make him think twice the next time he wants to smear one of his constituents to raise money out of state," she writes.