Election judges in Texas and informed citizens should read the following three items:
(1) "Attorney General Abbott Tells International Election Observers to Abide by Texas Election Laws" at https://www.oag.state.tx.us/oagnews/release.php?id=4195
(2) Texas Poll Watcher's Guide 2012 Q&A
Q. Who is allowed inside the polling place?
A.
1. Election judge and clerks. [Secs. 32.071 & 32.072].
2. Poll watchers and Secretary of State inspectors. [Secs. 33.052 & 34.002].
3. Persons admitted to vote. [Sec. 63.001].
4. Children under 18 years old who are accompanying a parent who is admitted to vote. [Sec. 64.002(b)].
5. Persons providing assistance to or interpreting for a voter who is entitled to assistance or to an interpreter. [Secs. 61.032 & 64.032; 42 U.S.C. 197aa-6].
6. Federal inspectors appointed by the U.S. Department of Justice.
7. Persons summoned or appointed by the presiding election judge to act as special peace officers to preserve order. [Sec. 32.075].
8. Voting system technician on the request of the authority holding the election. [Sec. 125.010].
(3) Texas Election Code Sec. 32.075. LAW ENFORCEMENT DUTIES AND POWERS.
(c) In performing duties under Subsection (a), a presiding [election] judge has the power of a district judge to enforce order and preserve the peace, including the power to issue an arrest warrant.
Don't be surprised if Holder supplies them with federal credentials, saying they are approved "special" inspectors.
Diplomatic immunity may make them immune to arrest. It doesn't make them immune from getting beaten up by outraged citizens.