https://www.newamerica.org/insights/what-we-know-about-congressional-primaries-and-congressional-primary-reform/why-hasnt-the-top-two-primary-been-more-transformative/
Why Hasn't the Top-Two Primary Been More Transformative? - New America
top two primary
https://www.kqed.org/news/137906/how-the-top-two-primary-played-out-in-congressional-races
How the Top-Two Primary Played Out in Congressional Races | KQED
New voting system created a free-for-all in some districts and a few contests to watch in November.
top two primaryplayed out