Sen. Kamala Harris (D., Calif.) failed to realize that news organizations do not just survey their own viewers when she used Fox News poll results to exaggerate popular support for impeachment.

The failed presidential candidate said a Fox News poll, which found that about half of voters support impeachment, demonstrated that “even viewers of Trump’s favorite network are turning on him.”

Like most major news outlets, Fox News teams up with dedicated polling firms that survey a nationally representative sample of random Americans by telephone. The poll cited by Harris sampled 1,000 registered voters and slightly over-sampled Democratic-leaning voters, 46 percent to 41 percent.