Court records show 62-year-old Richard Korn was arrested Monday for dealing in child pornography and sexual exploitation of children.
New Castle County police say their investigation began last month when officers were called to Korn's Hockessin home to investigate possible child porn.
Police returned with a warrant last week and seized computers and other evidence. Police say they found more than 25 images of child pornography.
Korn ran unsuccessfully for New Castle County executive in 2004, state House in 2006 and state auditor in 2010.
Bail was set at $750,000 and Korn remains in custody. An attorney for him could not immediately be located.