You can read the complaint at this link.
UPDATE: I have now had a chance to look at the legal arguments in this complaint. I cannot speak to the state constitutional issues, but as to the U.S. Constitutional issues, this seems exceptionally weak. The argument is that the failure to allow some voters within the state to serve as poll watchers violates equal protection, due process and First Amendment speech rights. I have never seen such an argument not extended to the act of voting, but to the act of watching at the polls. I cannot see how this severely burdens voters’ rights, and nothing in the complaint demonstrates that it does. I don’t think the federal arguments have much of a chance of going anywhere.
(It also seems awfully late in the process to be filing this).