This case concerns a challenge to Texas's congressional redistricting plan, which is based on total population from census data rather than eligible voter population. The plaintiffs argue this dilutes some voters' influence. The Fifth Circuit dismissed the case, finding no substantial evidence of an equal protection violation. The respondents argue precedent requires using total population and the plan's population deviations are acceptable. The Supreme Court must consider whether to require apportionment based on eligible voter population instead of total population from the census.