Democrats who walked out on Holder contempt hearing were apparently followed for a time by the ATF, but agents were told by their supervisors to let the subjects go. Last seen heading toward border. Conspiracy theory abounds that American politicians directly cause Mexican bloviating — theory holds that by intentionally letting the Dems walk, DOJ could be laying groundwork for a political argument to restrict constitutional speech and debate rights. But we’ll never know until we finally get some transparency …