I am not a TX lawyer so I can't define "pardon" in TX terms, but in FL a pardon is a/k/a "executive clemency" and is essentially the giving of a clean slate for a prior offense from the Governor. It is supposed to be a fair and equal opportunity process for which anyone can apply but in practice it is more often then not a "political gift" that only the "connected" enjoy.
Although a pardon, in FL at least, does wipe the slate clean it does neither erases the fact the offense occurred nor does it preclude the federal government from doing anything - including deporting someone. Now if you are expecting that president Obama is going to issue a federal pardon in this case that may be another story, but I suspect that you were either misinformed or misunderstood the consequences of the plea.
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Only God may (allegedly) forgive and grant a "pardon" - not the great state of Texas through its mighty governor.., unless, of course you significantly contributed to his reelection campaign (doesn't want to run again we are told).
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You need to talk to an attorney adept at handling post-conviction writs to see if anything can be done to undo the plea - it may not have been voluntary if the defendant was not aware of immigration consequences. Also, that person can petition the governor for a pardon. They are not often granted, but it may be worth a shot. Someone who looks at the case and what is in the official record will be able to advise you better than attorneys here.
I agree with my colleagues. You should talk to an immigration attorney about your specific options.
Angelique Montes, Esq., Immigration Attorney in Houston, Texas. This is not legal advice and a client-attorney relationship is not created. The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.