In 2012, I reported that many Texas voters did not have government issued identification that the new laws required, particularly in heavily Hispanic counties and in counties with large numbers of seniors.This remains a key issue in an on-going federal lawsuit.
http://www.chron.com/news/houston-texas/article/State-s-contested-voter-ID-law-could-affect-3390155.php
Here's the other stories in the Houston Chronicle's 2012 series on voter registration snafus:
The problematic purge: How the living were confused with the dead in a purge led by the Texas Secretary of State 11/1/2012
http://www.chron.com/news/politics/article/Texas-voter-purge-made-repeated-errors-4001767.php
Data showed voters in minority legislative districts more often got purge letters than those living in other districts.
http://www.chron.com/news/politics/article/African-American-voters-hit-harder-by-Harris-3913984.php
How motor voters got stalled by snafus. This story, prompted by complaints from college-aged voters, who said the voter registration forms were never processed.
http://www.chron.com/news/houston-texas/houston/article/Motor-voters-missing-on-rolls-3987151.php
Those problems led to increases in provisional ballots in some counties.
http://www.chron.com/news/article/Hundreds-of-motor-voters-forced-to-cast-4038425.php
Purges outpace new registrations. This story explores why Harris County rolls appear to remain stagnant even as population grows:
http://www.chron.com/news/houston-texas/article/Voters-rolls-stay-stagnant-as-population-surges-2830304.php
Some rural counties fall behind in purging voters who've moved on - or died.
http://www.chron.com/news/houston-texas/article/Conservative-watchdog-group-questions-counties-3467513.php