Saying the Republican senator is no different from a Democrat, the head of the group is calling for Mr. Brown to donate to charity or disgorge campaign money equal to how much the trust spent supporting him during the 2010 campaign…

The trust didn’t give the $96,000 directly to the Brown campaign, paying for and running ads backing his candidacy independently.

“We’d recommend that he take that money and spend it on a primary opponent who is more conservative,” Mr. Wheeler said.