Personally, I support the right to keep and arm bears.
And, Old Guy, you may be right about the gun banners being among the group. But, I have also noted that there are representatives from damn near every single-issue political cadre out there demonstrating (at least here in the midwest). I've seen right-to-lifers and pro-choicers (not necessarily standing real close to one another, but they're there). There have been VPs from corporate America and folks showing up on their way home from the unemployment office. Students and city truck drivers. I think that this threatened war has (as was the case in many of the later Vietnam protests) made some very strange bedfellows, indeed.
I expect that you are also correct in saying that someone is suing the Pres. for waging an undeclared war. Unfortunately, the political forces on the Courts, while not as evident and easily read (save for the 2000 case of electile dysfunction), do have an effect and have done so in every case since the War Powers act was passed when presidents went ahead without the benefit of Congressional a mandate.
Fact is, I think that WW II was the last formally declared war, and how many "conflicts," "police actions," and "rescue missions" have we been in since? I imagine that every one of them, at least since the end of the VN war, caused someone enough distress to get them to file a suit against "the Man." And all were thrown out by courts that were unwilling to challenge the President, even if they may have believed privately that the suits had merit.