ST. PAUL, Minnesota (CNN) - Democrat Al Franken currently holds a slight edge over incumbent Republican Sen. Norm Coleman in Minnesota's still unresolved U.S. Senate race, according to a running tally on the Minneapolis Star Tribune's Web site.
The newspaper's mid-morning tally showed Franken with a 102 vote margin over Coleman with several hundred ballots still to be reviewed. On Thursday evening, Coleman had been ahead by single digits.
But the race remains fluid: the results reported by the Star Tribune are an ongoing tally, with hundreds of challenges still to be reviewed Friday.
Minnesota Secretary of State Mark Ritchie has said that he and the rest of the four-judge panel who comprise the canvassing board will not end their work day until all remaining challenges have been reviewed.
One major wild card that remains are roughly 4,000 ballots that were originally challenged by the campaigns, who have since withdrawn those challenges. The Secretary of State's office has yet to declare how or when those ballots will be awarded to the candidates.
Another issue: the State Supreme Court ruled Wednesday that improperly rejected absentee ballots should not be tallied unless both campaigns and county elections officials agree the ballot was improperly rejected. It's estimated there are about 1,600 improperly rejected ballots.
(Updated at noon with additional information)