Lenny Bronner

Washington, D.C.

Principal Data Scientist, Elections

Education: Stanford University, MS in statistics; Stanford University, BS in mathematical and computational science

Lenny Bronner is a data scientist on the newsroom engineering team. He focuses on elections, including results, campaign finance and voter registration data.
Latest from Lenny Bronner

Even partisans hold surprisingly heterogeneous policy positions

Many were caught off guard by the “Rich Men North of Richmond” singer’s multi-faceted policy views. They shouldn’t have been.

August 29, 2023

Black turnout dropped sharply in 2022 midterms, Census survey finds

Black voter turnout in the 2022 election fell by nearly 10 percentage points from 2018, a decline that might have hurt Democratic candidates in some midterm contests.

May 2, 2023

Here’s what actually happens when voters move between states

A review of interstate moves shows how common partisan infiltration actually is.

March 2, 2023

Arizona precincts with voting problems were not overwhelmingly Republican

Data analysis by The Washington Post undercuts claims pushed by Kari Lake and former President Donald Trump, among others.

November 13, 2022

    How The Post tracks elections

    Data scientist Lenny Bronner explains how The Post’s election model will track races during the midterms.

    November 7, 2022

      How The Washington Post reports election race calls

      This year, for instance, because there are so many competitive races for House and Senate, we might not know which party controls either chamber of Congress on Election Night. That answer could take some time.

      November 7, 2022

      Arizona Republicans encourage early voting after warning against it

      Some in the party worry their assaults on early voting could ultimately suppress GOP turnout.

      November 6, 2022

      Number of early votes cast surpasses early-vote total in 2018 midterm election

      Despite objections from some Republicans, early voting continues to be popular.

      November 6, 2022

      1 million vote early in Georgia, a dramatic increase from 2018

      The vast majority cast their ballots in person, and mail-in-ballot requests have fallen significantly from past election cycles.

      October 25, 2022

      What the urban-rural split in the 118th Congress will look like

      The Congress that is seated in January will have a familiar urban-rural divide — but the differences may be more subtle than you expect.

      September 29, 2022