Another documented incident of Union sentiment in Texas on the eve of the war:

Union Sentiment in Texas

March 27, 1861 Tri-Weekly Alamo Express , San Antonio, TX

Our dull and gloomy city was enlivened by a pleasant and stiring event on Tuesday last; some four companies of the 3d, Infantry, Maj. Brooks in command, passed through our city with the flag of our country flying gaily on the breeze and the fife and drums playing ‘Yankee Doodle’; they were saluted with many a warm cheer, and many a curse fell upon the heads of those who have “precipitated” our state out of the Union. The troops were accompanied by a long train of waggons.

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And of course Governor Sam Houston was very much against secession:

A slaveholder himself and an outspoken opponent of abolition, he nonetheless voted consistently against the expansion of slavery into new territories and was a vehement opponent of secession.

These views made Houston unpopular with the Texas legislature, but in 1859, as he was about to leave the Senate, he was once more elected governor and he used the office to continue his campaign against secession. In 1861, when Texas voted to separate from the Union, Houston still held out, arguing that Texas apart from the United States was an independent republic. As chief executive of the republic, he refused to swear allegiance to the Confederacy, and as a result he was removed from office.