Updated

When Sen. Roland Burris retires from the Senate after serving a partial term, he might not be remembered for his attention to detail.

The outgoing Illinois Democratic senator, in the course of an interview with the Chicago Tribune, mistakenly referred to his colleague Sen. Russ Feingold as "Ralph" and "Feinberg," according to the Tribune's profile.

"We've had a great relationship," Burris said.

Feingold, a Democrat, was among the first to support Burris for the seat that used to belong to President Obama. Burris' appointment generated controversy when ex-Gov. Rod Blagojevich named him under a cloud of ethics allegations.

The senator from neighboring Wisconsin is now engaged in a tough fight for his seat against Republican businessman Ron Johnson.