Speaking openly about being evicted and failing to pay taxes, Bush has said her background as a single mother of two children connects her to working families in the district.
Clay, long a solid vote for Democratic policies, has touted his support for Sen. Bernie Sanders' Medicare for All plan, Ocasio-Cortez's Green New Deal, and for impeaching President Donald Trump -- all positions that put him left of other centrist Democrats such as House Speaker Nancy Pelosi.
Clay has also pointed to his role in bringing the multimillion-dollar National Geospatial-Intelligence Agency campus to north St. Louis.
A third candidate for the Democratic nomination, Katherine Bruckner, had captured about 6.3% of the vote -- 5,142 votes as of 10:30 p.m.
Winnie Heartstrong and Anthony Rogers both filed for the GOP nomination but did not mount active campaigns. Rogers was on track to win Tuesday with a 25-point margin.
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