HARRISBURG, Pa. (AP) — When Nikki Haley suspended her presidential campaign, she refused to endorse Donald Trump as the last remaining major candidate for the 2024 Republican nomination — and apparently so did some of her supporters in Pennsylvania.

Haley won almost 17% of Pennsylvania’s primary vote Tuesday, or 1 in 6 votes, to Trump’s 83%, despite not campaigning for president since she ended her bid in early March.

Pennsylvania’s 19 electoral votes up for grabs in the presidential election make it a premier battleground state. So should those Haley GOP voters refuse to support Trump in November, it could prove a damaging blow to his prospects for victory in the state and, possibly, reelection.

Haley’s base was never big enough to seriously challenge Trump before he clinched a third straight Republican presidential nomination, but her supporters have continued to vote for her in primaries in Pennsylvania and elsewhere even after she dropped out.