If a protest campaign in every sympathetic, meaning a Senator or Representative that would react to some guys with signs protesting in their state capitol, could get news media attention that would be effective in highlighting the issue, but that has to be coupled with the letter writing and emailing and calling those elected officials to tell the that their voters expect them to put a stop to the specific issue (in this case the BATFE proposal to ban the sale of M855 ball ammunition to the public).