Which action constitutes an offense of obstruction or retaliation according to Texas law?

The action that constitutes an offense of obstruction or retaliation under Texas law is the intimidation of a judge by posting their home address after an unfavorable ruling. This action is specifically designed to threaten or coerce a public servant, in this case, the judge, and is intended to impede their official duties or to retaliate against them for their decisions. The law recognizes such conduct as a serious offense because it undermines the integrity of the judicial system and puts public officials at risk.

The other options, while they may involve unpleasant or contentious behavior, do not meet the legal threshold for obstruction or retaliation. Simply posting a political address online, protesting, or publicly criticizing a judge's decision, while potentially problematic or offensive, do not directly intimidate or threaten a public servant in the way outlined in the relevant statutes. Such actions may fall into categories of free speech or political expression, which are protected under the law, unlike intimidation or retaliation which has specific legal ramifications.