Republican US Senator Scott Brown has agreed to pay a fine to honor “The People’s Pledge,” the first such penalty since he and Democrat Elizabeth Warren agreed to mutually police advertising from outside political committees. The infraction appears to be a small one. A group called CAPE PAC is running Google ads promoting Brown. The ads are linked to the group’s website, which solicits donations for several Republican candidates. The cost of the ad campaign will not be known until the group files its federal campaign reports, but the group does not appear to have advertised extensively.