This is how the battle between Jessica Cisneros and Henry Cuellar for the Democratic candidacy progresses in a key district in Texas | Videos | CNN

The race for the Democratic nomination in one of Texas's congressional districts is attracting national interest.

The young lawyer Jessica Cisneros challenges Representative Henry Cuellar for the second time in what has become a kind of "civil war" in the Democratic Party.

This is a contest where a federal investigation and the ideology of the candidates will be factors in deciding the winner.

Gustavo Valdes has the details from Laredo.