His name shows up in this 2005 article from Texas Weekly (Ross Ramsey, who's now at the Texas Tribune) as sec/treas of a 527 formed that year to raise money to elect Republicans to the Lege.
http://texasweekly.com/newsletter/tw20051024.html (about 3/4 of the way down, under headline "Issue Campaigns of the Near Future")
His website is under construction.
www.davidjporterpc.com
There's another David J Porter CPA in Midland, and one on Twitter, who do not appear to be the candidate.
Bill Crocker, listed above in the first link as president of that PAC, is an RNC member from Austin. A Perry supporter,
Kuffner says here that Crocker formed the PAC to go after "liberal Republicans". It's heavily Leininger-funded; that year they went after Carter Casteel and a few others who had opposed school vouchers.
Jeff Norwood, listed as the PAC's V-P is owner of Anthem Media, a highly-regarded GOP political consulting firm. He ran Dee Margo's campaign in '08, for one. In 2006 he ran all five of the challenger's campaigns mentioned above; that made him some enemies among incumbents who turned back the challenges. More on that in the second link below:
http://www.capitolinside.com/consultants2008.htmhttp://www.mysanantonio.com/news/MYSA090307_03B_Robison_2e2fb45_html1404.html So I would surmise from this all data that this is Victor Carillo's TeaBagger challenger, and he may be well-funded if he has established some relationship with James Leininger, having already been cashed a few six-figure checks from him for the PAC. And if the guy has enough money to afford Norwood, he's not to be taken lightly.
Carillo, though the incumbent, had brain surgery last year and has reportedly made a complete recovery, but I do not know his relationship with the party hierarchy or his favorability among the TeaBag wing of the party.