craig: good night, everybody. captioned by the national captioning institute www.ncicap.org . this is 9news now. in 2010, the mayoral campaign was compromised by back room deals, secret payments and a flood of unreported cash. bagging another conspirator in election corruption and the illegal activity goes back for more than a decade. and we are now learning just how widespread this illegal activity is alleged to have been. prosecutors say corruption infiltrated campaigns for the senate, the house of representatives, even the presidential campaign of 2008. the center of the conspiracy is here in dc. the center of the investigation, the 2010 mayor s race. our gary nurenberg is here to tie it all together. gary. reporter: the headline today, a guilty plea from a big sforter of dc supporter of dc mayor gray. $650,000. can you tell us why you did it. no comment. thanks. reporter: 75-year-old eugene harris admitn federal court the role in what prosecutors call
how widespread this illegal activity is alleged to have been. prosecutors say corruption infiltrated campaigns for the senate, the house of representatives, even the presidential campaign of 2008. the center of the conspiracy is here in dc. the center of the investigation, the 2010 mayor s race. our gary nurenberg is here to tie it all together. gary. reporter: the headline today, a guilty plea from a big sforter of dc supporter of dc mayor gray. $650,000. can you tell us why you did it. no comment. thanks. reporter: 75-year-old eugene harris admitn federal court the role in what prosecutors call a shadow campaign to elect vincent gray mayor in 2010. today s plea confirms the sad truth that many of us have long feared. the 2010 mayoral election was corrupted by a massive infusion of cash that was illegally concealed from the voters of the district. reporter: prosecutors say harris, a long time employee, arranged to have contributions to the gray campaign illegal