Texas is the most un-primary of primaries there is.
For one thing, there aren't any delegates awarded to the winner of the state -- no statewide bonus delegates, nothing. For another, a third of the delegates will be chosen through a complicated caucus system.
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The process has two steps. First, folks vote. 126 delegates will be accorded proportionally via state senate district. Then, when polls close, they caucus in more than 1,000 precincts.
At the caucus, attendees chose the identity of the delegate and the presidential candidate that the delegate is supposed to represent. These delegates are sent to a "senatorial convention" a few weeks later, during which the final math is worked out and the actual delegate slate for the convention is chosen.
67 delegates will be chosen this way.
Suffice it to say: whatever you call Texas's system -- a hybrid, a primacaucus, whatever -- do not assume that, because it's a big state and the media calls it a primary, the math favors Hillary Clinton.
http://marcambinder.theatlantic.com/archives/2008/02/texass_unique_primaucus.php