At first glance, Hillary Rodham Clinton should easily win Michigan's Democratic primary, since no other top candidates are on the ballot.
But she faces an unusual opponent: Uncommitted.
If enough backers of the four candidates who aren't on the ballot mark Uncommitted when they vote January 15, it could take some of the luster off what's otherwise a certain Clinton victory.
The vote could give backers of Barack Obama, John Edwards, Bill Richardson and Joe Biden some of the uncommitted slots when Democrats hold district conventions in late March to choose half their national convention delegates.
The four removed their names from the ballot last month.
So far, the Clinton campaign doesn't seem too worried. A spokesman declined to comment on the possibility of Uncommitted doing well.