Found his wiki. Looks like he’s running for the TX-25 district (which has been modified due to the Census). If victorious in the primary he’ll likely face Lloyd Doggett who won his 2010 election by only 15,000 votes. The newly redistricted seat might give Doggett more of a challenge.
http://en.wikipedia.org/wiki/Michael_L._Williams
http://en.wikipedia.org/wiki/Texas%27s_25th_congressional_district
http://www.williamsfortexas.com/about
If Michael Williams wins the TX-25 primary, he’ll face a Democrat sacrificial lamb. Doggett is running in a new Austin-to-San Antonio Hispanic-majority district ( numbered the TX-35 IIRC).