WASHINGTON (AP) — A New York marketing executive received more than $600,000 in illicit funds to do unsolicited campaign work for a 2008 presidential candidate, federal prosecutors in Washington said Wednesday.

Troy White pleaded guilty to a misdemeanor for failing to file tax returns reflecting the amount his company, Wytehouse Marketing Inc., was paid. But court documents outlined an elaborate scheme in which White allegedly worked with District of Columbia businessman Jeffrey Thompson to help a presidential candidate during several Democratic primaries in the winter and spring of 2008.