Ramsey County prosecutor says the group's data from the 2008 Senate race overwhelmingly was not accurate.
On the heels of a conservative group's study, the Minnesota Republican Party on Thursday asked all county attorneys to check whether felons voted in Minnesota's 2008 election.
Meanwhile, DFL gubernatorial candidate Mark Dayton Thursday took Gov. Tim Pawlenty to task for saying that possible illegal voting by felons "may have flipped" the whisker-thin 2008 U.S. Senate race between Democrat Al Franken and Republican Norm Coleman
"Before people, including Gov. Pawlenty, make wild specious claims ... they really ought to have the facts," said Dayton, a former U.S. senator.
State GOP Chairman Tony Sutton said that nothing can overturn the results of the now-settled Senate race, but he still wants the facts.
"We must have answers to ensure that this kind of fraud does not take place in the future," Sutton said in a letter to county attorneys in all 87 Minnesota counties.
U.S. Rep. Darrell Issa, R-Calif., also waded into the controversy Thursday, asking Secretary of State Mark Ritchie to preserve all records from the two-year-old election.
The issue has reawakened the high passions of the 2008 Senate election, which went into recount and then trial before being settled a year ago.
Pawlenty, a Republican who appears to be prepping himself for a presidential run, said that based on the group Minnesota Majority's research, illegal felon voting may have handed Franken the win.
Minnesota Majority claims to have found hundreds of felons voted in largely Democratic Hennepin and Ramsey counties in 2008.
"I suspect they favored Al Franken. I don't know that, but if that turned out to be true, they may have flipped the election," Pawlenty said on Fox News Wednesday.
Dayton said that for Pawlenty to cast such "wild aspersions" without absolute facts is "extremely irresponsible."
County attorneys have said Minnesota Majority's work is flawed. Phil Carruthers, director of the prosecutions division in the Ramsey County attorney's office, said the group's statistics were overwhelmingly "not accurate."