Correction: My chart was for Houston voters, not all Texas voters. There are more Hispanics than Anglo whites in Houston and more Hispanics than blacks.
My figures came from the Houston Chronicle, which published vote results by area of the city and by groups of voters (Hispanics, blacks, affluent white, etc.).
I don't see them explained.
And what are the envelope parameters of each discrete packet? Precincts or wards? Ethnographic subgroups?
It does seem that Hispanic voters are an outlier off-trend, and they swung about 40 points toward the GOP when the candidate was Hispanic. I think that had to be Orlando Sanchez for mayor (he was Cuban-American and cringeworthily close to the Bush family -- Poppy even did cringey ads for him) in 2003, and Antonio Sanchez ("de Santa Anna") for Governor, the year Sue Schecter and Debra Danburg and Molly Yard had that brilliant idea to make the top of the statewide ticket all-minority except for Lt. Governor. It was a catastrophe; the Yaller Dogs in East Texas stayed home, and Sanchez and his MeChista-influenced buddies went down like the Hindenburg.
Your graphic displays the guts of the Rove-Bush calculation. Which is to nominate Hispanics defensively, to get that 40-point swing. Which overlooks that you are still giving the Democrats a 60-point share! And most of your swing, I'll warrant, is coming from (as I've said before) Central and South Americans, not the bullheaded Tejanos, who might better be called PRIistas.