After three terms in the US House and two unsuccessful campaigns for the US Senate, Colin Allred said he's heard plenty about voters' suspicions that politicians are just trying to make a buck in Washington.

"'What about the stock trading in Congress? What about people getting rich in Congress?'" Allred said they ask him regularly. "And I have to say to them, you're absolutely right about that, too. We need to be better."

He's challenging Representative Julie Johnson in the Democratic run-off for a Dallas-area House seat on Tuesday, and he's one of several candidates trying to harness populist anger over congressional stock trading. Allred has denounced Johnson for trades involving companies like Palantir, a data analytics firm with ties to President Donald Trump's administration.