There is of course enormous amounts of information out there on all the candidates, particularly those that have been in office for a while. Brady has been a congresscritter from the 8th district since '96 so he has a sizeable voting history: TEXAS ON THE POTOMAC did a nice job of putting much of it on a single page -- with outside links.
The only opponent I'm aware of in the primary is a newcomer fresh out of the oven, Tyler Russell. He appears to be a decent young man but IMHO he's in a bad district to try to knock off another Pubbie with a good voting record AND who typically garners 65% to 70% of the vote in the general elections.
District 23 currently has Ciro D. Rodriguez(D)
http://www.rodriguez.house.gov/
voted no to cap and trade but yes to Obamacare. He’s pretty entrenched and I sure hope he’s GONE in Nov!
The conservative that’s running against him is
Francisco “Quico” Canseco (R)
http://www.cansecoforcongress.com/
I don’t know too much about him yet, but so far he’s looking good and he’s not Rodriguez!