Why Is Norm Coleman's Lead Slipping?

Markos Moulitsas notes that Norm Coleman's lead over Al Franken has been diminishing:
A reader has been tracking vote results updates from the Minnesota's SoS office:

9:15 AM
Coleman: 1,211,520
Franken: 1,211,077

10:15 AM
Coleman: 1,211,525
Franken: 1,211,088

1:20 PM
Coleman: 1,211,527
Franken: 1,211,190

That means the gap has gone down from 443, to 437, to 337 as provisional and other straggler ballots are counted. It was 477 votes last night.

Coleman's lead is now down to 236 votes, but the gap is not tightening because "provisional and other straggler ballots" remain uncounted. According to the Minnesota Secretary of State's office, the state does not have provisional ballots and all absentee ballots had to arrive on or before Election Day to be counted.

http://www.weeklystandard.com/weblogs/TWSFP/2008/11/why_is_norm_colemans_lead_slip.asp