Texas Election Code - ELEC § 33.002. Appointment by Candidate

(a) Watchers may be appointed by each candidate whose name appears on the ballot or the list of declared write-in candidates in an election for:

(b) In an election for an office of the state government that is filled by voters of more than one county, watchers may also be appointed by the candidate's campaign treasurer.

(c) In an election for an office of the federal government that is filled by voters of more than one county, watchers may also be appointed by the chair or treasurer of the candidate's principal campaign committee or by a designated agent of the chair or treasurer.