Washington, D.C. ? A former aide to Sen. Maria Cantwell, D-Wash., pleaded guilty Thursday to a federal child pornography charge.

James Michael McHaney, of Washington, D.C., faces up to 10 years in prison after his felony conviction. He was fired from his job as a scheduler for Cantwell after his arrest last year. Earlier, he had worked for the 2004 presidential campaigns of Democrats Dick Gephardt and John Kerry.

Prosecutors say McHaney, 28, tried to arrange a sexual encounter with a 13-year-old boy in November. Police later found child pornography in his car and home.

He was initially charged with attempting to sexually exploit a minor, but pleaded guilty to a reduced charge of possession of child pornography. Prosecutors said he had more than 1,000 images of child pornography, as well as videos and DVDs portraying children as young as 3 engaged in sexual conduct.