Clark had taken a job in Washington when Lewis called last month and asked him to manage his campaign.
"I've had the luxury of working for two candidates that I believed in,” said Clark, who grew up outside Chicago. "I just said to myself, 'This is the guy who’s got to be our next senator.'"
Lewis faces former state Sen. Cal Cunningham and Secretary of State Elaine Marshall in the May 4 Democratic primary. The Chapel Hill attorney led his better-known rivals in fundraising, according to new reports.
And in a primary where it takes 40 percent of the vote plus one to win, Lewis is relying on a solid base. That's because African American voters make up as much as 41 percent of the state's Democratic electorate.
Last fall, in a city where about 35 percent of registered voters are black, Foxx relied on a strong African American vote to beat Republican John Lassiter.