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

    Who is ahead in Harris vs. Trump 2024 presidential polls right now?

    Check out The Washington Post’s presidential polling averages of the seven battleground states most likely to determine the outcome of the election.

    September 17, 2024

    How Republican or Democratic is your name?

    Rummaging through one of biggest, most valuable datasets not in government hands, we discovered some fascinating links between names and politics.

    September 13, 2024

    Harris’s rise in the polls has stalled, while Trump holds steady

    Two possible explanations for why Harris’s poll numbers have begun to plateau and how we should think about the race ahead of Tuesday’s debate.

    September 10, 2024

    How The Washington Post’s presidential polling averages work

    Everything you need to know about The Post’s polling averages, from the polls we include to how we handle polling error and uncertainty.

    September 4, 2024

    Harris has opened up a second path to victory, according to The Post’s polling model

    Our modeling shows that Harris has two paths to possible success: the Rust Belt states of Michigan. Wisconsin and Pennsylvania and the Sun Belt states of Georgia, Arizona and Nevada (she could win in either region and still claim the White House). Meanwhile, Trump’s must win both the Rust Belt and Sun Belt to triumph.

    August 15, 2024
    The presidential race has dramatically been reset since Vice President Kamala Harris entered it, according to The Washington Post's polling model.

    Harris's expanding path to victory

    Vice President Kamala Harris is polling well among voters in key battleground states, and her campaign is expanding its ground game in other key states that appeared to be out of reach for Democrats with President Joe Biden at the top of the ticket.

    August 13, 2024

    Harris may need less of popular vote to win electoral college

    Such an outcome is possible if she can eke out a victory in the tipping-point state.

    August 13, 2024
    Vice President Kamala Harris may be able to win the electoral college with a smaller margin of the popular vote than previous Democratic presidential nominees.

    The most religious, and religiously diverse, places in America

    This week, we mine the U.S. Religious Census, a decennial count of America’s faithful, for insights into the geography of religious devotion. We also compare people’s claims on church attendance to their actual behavior.

    June 28, 2024

    Where 2024 voters moved since 2020 — and how they registered

    Millions of Americans moved between states since the last presidential election. We took a look at what voter data tells us about those moves.

    April 11, 2024
    A moving struck sits outside a home in the Rosewood neighborhood of Myrtle Beach, S.C., on Sept. 19, 2022. (Madeline Gray for The Washington Post)

    1 in 5 GOP primary voters keep bucking Trump. What does it mean?

    The Republican presidential nominating contest effectively came to an end nearly a month ago, but the protest vote against Trump is still going strong.

    April 4, 2024