Mississippi Atty. Gen. Mike Moore said he may reopen the 25-year-old case of three civil rights workers whose slayings inspired the movie "Mississippi Burning." Moore said he is reading the 2,800-page transcript of the federal trial of 19 men on civil rights charges and is trying to talk to some witnesses. "The first hurdle we have to jump is whether the evidence is enough to successfully prosecute," Moore said recently. "Second, is it in the best interests of the people of this state?" Word that the case might be reopened came on the eve of a special commemoration of the murders of Andrew Goodman, a white New York resident; James Chaney, a black Meridian resident, and Henry Schwerner, a white New Yorker.