"The Unites States government wants to take another shot at Roger Clemens .

Acknowledging Friday they were to blame for the mistrial that ended the pitcher's long-awaited perjury case last month, federal prosecutors Friday asked U.S. District Court Judge Reggie Walton in Washington to schedule a new trial. A glaring mistake - showing a jury evidence Walton had barred - was, they said, the .result of pretrial time constraints, a focus on jury selection and opening statements.

"Appropriate redaction was the government's duty," the prosecutors wrote in a 36-page brief filed in D.C. "The government accepts responsibility for its oversight, and regrets the burdens that error has placed on this court and defendant."

But the brief urged Walton to disregard a motion by Clemens' attorneys seeking dismissal of the six felony charges the pitcher faces based on his 2008 testimony before a congressional panel investigating steroids in baseball.

"As regrettable as this mistake was, it does not warrant the extreme measures of a prohibition on any retrial and the dismissal of defendant's indictment," wrote prosecutors Steven Durham and Daniel Butler ."