Former presidential candidate Andrew Yang.SAUL LOEB/AFP via Getty Images Andrew Yang's 2020 presidential campaign committee still owes money. A Federal Election Commission letter put the tab at more than $190,000. Since running unsuccessfully for mayor of New York City, Yang started a third party. Andrew Yang's 2020 presidential committee often summed its campaign up in a single word: "MATH."But the Federal Election Commission, which regulates and enforces the nation's campaign finance laws, is questioning Yang's addition skills."Your report discloses a negative ending cash balance of $190,861.62," a June 30 letter to the Yang campaign states.