Dozens of lawyers will gather in a federal courtroom in Corpus Christi, Texas, on Tuesday for the start of a new challenge to the state’s controversial voter ID law. The trial is expected to last two to three weeks, but it’s unlikely to be the end of what’s already been a long, convoluted journey for the Texas law — and many others like it. First, some background: Texas’ Republican-controlled Legislature passed new photo ID requirements for voters back in 2011. Supporters said the law was needed to prevent voter fraud, although opponents noted that there was little evidence of such fraud at the polls. At the time, the state was covered by Section 5 of the Voting Rights Act, which meant it needed federal approval for the law to go into effect, because the state had a history of discrimination against minority voters. The case ended up before a three-judge federal court in Washington, D.C., which in 2012 ruled against the state. It said Texas could not impose the new ID requirement, because the state was unable to show that it would not discriminate against blacks and Latinos. Under Section 5, the burden of proof was on the state to show that the law was nondiscriminatory.