An Associated Press analysis of the nearly 25,000-vote difference in Minnesota presidential and U.S. Senate race tallies shows that most ballots lacking a recorded Senate vote were cast in counties won by Democrat Barack Obama.
The finding could have implications for Republican Sen. Norm Coleman and DFLer Al Franken, who are headed for a recount separated by the thinnest of margins -- 221 votes as of Friday, or about 0.01 percent.
Though some voters may have intentionally bypassed the race, others may have mismarked their ballot or optical scanning machines may have misread them. A recount to begin Nov. 19 will use manual inspection to detect such ballots.
Three counties -- Hennepin, Ramsey and St. Louis -- account for 10,540 votes in the dropoff. Each saw Obama win with 63 percent or more.
Ballots that showed a presidential vote but no Senate vote are called the "undervote." Statewide, more than 18,000 of those ballots came from counties won by Obama with more than half the vote. About 6,100 were in counties won by Republican John McCain with at least 50 percent.
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