Stock traders have been watching out for Janet Yellen all week, but they were blindsided by Hillary Clinton.

Fed watching should continue Thursday, as traders digest durable goods and jobless claims data ahead of Friday’s Jackson Hole speech by the Fed chair. But they will also be licking their wounds after Democrat Clinton punctured the health-care sector with one powerful tweet Wednesday afternoon. The IBB Nasdaq Biotech ETF fell 3.4 percent, after Clinton tweeted that there’s no justification for the high prices Mylan is charging for EpiPens.

Mylan has been under fire for the dramatic price hikes in EpiPens, livesaving devices for people with severe allergies. Prices have gone from $100 in 2008 to more than $600 for some customers.

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image - Fed Chair Janet Yellen 2