Is a 142 a good lead for Coleman at this point?
If the trend continues at the same rate, he'll lose by a couple. Also, we don't know who has challenged more ballots that are obviously for the other candidate -- if Coleman's challenges are dumber then that's more votes for Franken.
Considering that the biggest Franken areas haven't been hit up yet.. Considering that Coleman has challenged more thank Franken, the fact that Minnesota strongly went for Obama (meaning if there are an equal number of miscounted undervotes for both Obama and McCain, that’s more votes Franken) and the fact that it’s people who make mistakes on ballots tend to favor the Democrats (we’re dumb), I think this looks slightly bad for Norm.
The most-educated and least-educated voters tend to be Democrats. Somebody who's never had to take a scantron test might not know to bubble in the circle on an optical scan ballot.