Kerri Evelyn Harris, who is challenging Sen. Tom Carper in Delaware's upcoming Democratic primary, waves while walking in a parade celebrating Delaware City Day in July.

Is mistrust of ‘big pharma’ enough to help unseat a Democratic stalwart in Congress?

WILMINGTON, Del. — Three miles from the sprawling U.S. campus of the pharmaceutical giant Astrazeneca, Kerri Evelyn Harris was campaigning to unseat the man who put it there.

Some 200 people had crammed into folding chairs, stood along walls, and spilled into hallways of a community center for a look at the candidate mounting a long-shot bid to unseat Sen. Tom Carper, an 18-year-incumbent, in the state’s Democratic Senate primary this Thursday.