Democrat Al FrankenAlan (Al) Stuart FrankenMeet the Democrats' last best hope of preserving a House majority Franken rules out challenge against Gillibrand for Senate seat Franken targets senators from both parties in new comedy tour MORE's campaign said another 12 uncounted ballots have been found in Minnesota's contested Senate election, while announcing it would withdraw an additional 425 challenges to ballots issued during the race's hand recount.

Franken's campaign said that a dozen "UOCAVA" ballots had been found in a Minneapolis-area warehouse by election officials searching for 133 ballots gone missing during the hand recount in the urban center's 3rd ward, 1st precinct. The ballots come from uniformed and overseas voters and were previously unopened and counted, Franken officials said.

"We believe strongly that these ballots should and must be counted prior to the conclusion of the recount," said Franken attorney Marc Elias in a Monday afternoon conference call. "There is considerable precedent for opening and counting this ballots."

The Coleman campaign expressed skepticism toward the newly-found ballots. "As the Minneapolis elections director stated, these ballots were unsecured and chain of custody procedures were not followed," said Coleman campaign spokesman Mark Drake. "They are subject to great question."

Elias reiterated the campaign's demand that election officials continue their search for the missing 133 ballots, but expressed optimism that if the ballots are not found, the state's Board of Canvassers would likely revert to the election night tally, following the Minnesota Secretary of State's stated preference to resolve the situation should the ballots not be found.

The campaign meanwhile withdrew 425 challenges it said it expects to face "no reasonable chance" of being upheld in front of the Board, when it convenes to review challenges December 15.