Photo Illustration by Luis G. Rendon/The Daily Beast/GettyThe Robert F. Kennedy Jr. campaign has a public Slack channel—and they don’t seem to care who joins it.They probably should.The link is being shared on Twitter. It doesn’t have any barriers to entry. And they texted an invite—accidentally, it seems—to a Daily Beast reporter.And yet, what’s even more odd about the longshot campaign so halfheartedly protecting its communications is that inside that Slack channel, which the campaign is effec