(CNN) -- A man accused of planning a "killing spree" against African-Americans in a 2008 plot that also targeted then-presidential candidate Barack Obama will be sentenced Friday in a federal courtroom in Tennessee.

Daniel Cowart, of Bells, Tennessee, admitted to conspiring with Paul Schlesselman of West Helena, Arkansas, in planning to kill more than 100 African-Americans, according to the Justice Department.

The two are self-described white supremacists who met online through a mutual friend, the U.S. Attorney's Office in Jackson, Tennessee, has said.

The men were arrested in October 2008 after an aborted robbery attempt outside Jackson, according to court records.

Cowart pleaded guilty in March to threatening to kill and inflict bodily harm upon a presidential candidate, conspiracy, intentional damage to religious property, discharge of a firearm during and in relation to a crime of violence, and multiple gun charges related to carrying a sawed-off shotgun across state lines.

His co-conspirator Schlesselman pleaded guilty in January to conspiracy, threatening to kill and inflict bodily harm upon a presidential candidate, and one count of possessing a firearm in furtherance of a crime of violence. Schlesselman was sentenced in April to 10 years in prison.

Cowart faces up to 75 years in prison under his plea agreement, the Justice Department said.