This 26-Year-Old Is Poised to Oust an Anti-Abortion, Pro-Gun Democrat

Democratic congressional hopeful Jessica Cisneros knows her opponent, incumbent Rep. Henry Cuellar (D-Texas), in a way that few candidates ever get to: she once worked for him.

In 2014, Cisneros, then 21 years old and attending the University of Texas at Austin, was Cuellar’s intern in Washington D.C., where she worked 9 to 5 every day in his office for several months. Years later, the experience not only contributed to her decision to run, she said it also served as a guide for how not to lead.

“It took me...