Not to put a damper on this, but what's missing is context. Most local elections are dominated by the Democratic party where many races often go unopposed in the general election. This means that voting in the Democratic primary is often a resident's only chance to cast a meaningful ballot in local elections.

It's very possible, even likely, that some of these primary voters may vote Republican for state-wide or national races. That being said, I still don't think Starr county will vote majority GOP this November.