The Democratic Party has shed 2.1 million registered voters since the 2020 election, while the Republican Party added 2.4 million, according to a New York Times analysis of voter-file data compiled by the non-partisan firm L2. The review spans 30 states and the District of Columbia that record party affiliation and shows Democrats lost ground to Republicans in every one of them between 2020 and 2024, producing a net swing of 4.5 million voters toward the GOP. Democratic erosion is visible in deep-blue enclaves, solidly red territory and crucial battlegrounds alike, including Arizona, Nevada, North Carolina and Pennsylvania. In those jurisdictions the Democratic registration advantage shrank from nearly 11 percentage points on Election Day 2020 to just over six points by 2024, the steepest contraction in decades. The shift is pronounced among new voters. In 2024, for the first time since 2018, more Americans who registered for the first time chose the Republican label over the Democratic one. Democrats’ share of new registrants under age 45 fell from 66 percent in 2018 to 48 percent in 2024, and their share among men slid from 49 percent in 2020 to 39 percent in 2024. “There is no silver lining or cavalry coming across the hill—this is month after month, year after year,” said Michael Pruser, director of data science at Decision Desk HQ. Maria Cardona, a Democratic National Committee member, acknowledged the party “fell asleep at the switch,” while longtime Democratic data analyst Tom Bonier called the numbers a “big flashing red alert.” The registration slump compounds other headwinds for Democrats ahead of the 2026 midterms. Federal Election Commission filings show the Republican National Committee ended July with $84.3 million in cash, compared with the Democratic National Committee’s $13.9 million, underscoring the scale of the party’s rebuilding challenge.