WASHINGTON — Sheila Jackson Lee, a Houston Democrat who was one of the longest serving members of Texas’ Congressional delegation and a longtime advocate for progressive causes, died on Friday amid her battle with pancreatic cancer. She was 74. Jackson Lee began her congressional career as an underdog, defeating four-term U.S. Rep. Craig Washingtonin the 1994 Democratic primary, before establishing herself as a fixture in Congress and Houston with ties to the highest reaches of the Democratic Party. Jackson Lee was a progressive fixture on Capitol Hill for decades. She was an early opponent of the Iraq War and advocate...