Well, as you note, Ron Paul opposes citizenship for people who enter the country illegally, so the billboard is accurate. The billboard doesn't say anything about amnesty.
The thing that seems ok to me about Ron Paul, as I wrote last December, is that he doesn't seem to be a radical, unlike George Bush, whose repeated assertion that any willing employer in America should be able to hire any willing worker in the world is as radical a (libertarian) statement as any ever uttered by an American president.
Paul seems ready to learn and change, as evidenced by the fact that his voting record has improved in Congress on the immigration issue since the votes you correctly cited. And even if he hadn't improved, he'd still be a heck of a lot better on the immigration issue as president than what we're likely going to get. See “Ron Paul On Immigration—The Good, The Bad, And The Idiosyncratic“.
But in any case, the purpose of the billboards is not to get Ron Paul elected, it's to try to point out how the system is giving us a choice between Tweedledum and Tweedledee, neither of whom is really in step with the American people on a range of issues. And on immigration, McCain, Obama, and Clinton (MOC) are not only out of step, they are marching in the opposite direction and to the beat of The K Street drum corps.
The bilboard, thus, is a way to try to force the immigration issue to the forefront of political debate where it belongs this presidential campaign. MOC are not going to talk about the issue, and neither will the Washington Post, New York Times, et al. That means another eight years wasted. If we can inject the issue into some battleground states, we'll force the candidates to at least give lip service to the will of the American people. If nothing else, that will embolden decent members of Congress to hold the line against the corpocracy.
If the billboards were to help Ron Paul's candidacy, then that's ok with me. He's a whole lot better on immigration than MOC, and if he's rewarded for that electorally, then good. That's the way it should be.
I do understand your concern, however, and you'll notice that we've added two other names to the anti-US citizenship for illegal immigrants slogan: Chuck Baldwin and Bob Barr. It's not that we're trying to get any of them elected–that's not our role–but we're trying to break the chokehold on public debate that the establishment exerts.
Thanks for the coment.