It’s not always fun to say I told you so.

For two years, Representative Marie Gluesenkamp Perez, a Democrat from a rural, red district in Washington State, has been criticizing her party for being too dismissive of working-class voters.

That message appears to have helped Ms. Gluesenkamp Perez, long considered perhaps the most vulnerable Democrat in the House, defy the odds in this week’s election. Even with President-elect Donald J. Trump at the top of the ticket and winning her district for the third cycle in a row, she appears on track to beat the same candidate she faced two years ago, the far-right Republican and former Green Beret Joe Kent, by a larger margin.

She declared victory in a statement on Thursday night after a newspaper in her district called the election for her, although The Associated Press had yet to do so.

Preliminary results showed her outrunning Vice President Kamala Harris by seven percentage points in two of the reddest counties in her district, including the rural timber county of Wahkiakum.

Ms. Gluesenkamp Perez, 36, who owns an auto shop now run by her husband, has angered progressives for sometimes crossing party lines, like when she voted with Republicans to repeal President Biden’s student loan forgiveness initiative. She argued that it didn’t do much for her district, where most people don’t have college degrees.