Comment: The only penalty I could find was this:

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In reply to comment: Yes, (see in situ)

The only penalty I could find was this:

And it does not apply to the subject. It seems like a big NO-No to me, yet the penalty is just a slap on the wrist--a Class C misdemeanor. Like a traffic ticket fine.

Texas Election Code - Section 162.014. Unlawful Participation In Party Affairs

§ 162.014. UNLAWFUL PARTICIPATION IN PARTY AFFAIRS. (a)
A person commits an offense if the person knowingly votes or
attempts to vote in a primary election or participates or attempts
to participate in a convention of a party after having voted in a
primary election or participated in a convention of another party
during the same voting year.
(b) An offense under this section is a Class C misdemeanor.

Acts 1985, 69th Leg., ch. 211, § 1, eff. Jan. 1, 1986.