The May 10 primary campaign

Democratic White House candidate Hillary Clinton lost a nominating contest to Bernie Sanders in economically struggling West Virginia on Tuesday, a setback that could signal trouble for her in industrial states in the November general election.

The defeat slows Clinton’s march to the nomination, but she is still heavily favored to become the Democratic candidate in the Nov. 8 election.

Still, her failure to win over voters deeply skeptical about the direction of the economy underscored the work she will need to do to court working-class voters in the Rust Belt, which includes key states such as Ohio and Pennsylvania. West Virginia has one of the highest unemployment rates in country.

Sanders, who has vowed to take his campaign all the way to the Democrats’ July 25-28 convention in Philadelphia, said he is the stronger candidate to beat presumptive Republican nominee Donald Trump in November.

“Working people are hurting,” Sanders said in Oregon Tuesday night after his West Virginia win. “We need an economy that works for all of us, not just the 1 percent.”

Trump, 69, won contests in West Virginia and Nebraska handily on Tuesday. (Reuters)

Here’s a look at the campaign trail and primary day.

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