With 76% reporting, Democrat Claire McCaskill has emerged with a very narrrow lead over Sen Jim Talent. Most of the late vote in Missouri breaks for the Democrat, so you would expect to see McCaskill stretching that lead as the night wears on. But no guarantees.
Late Update: CNN was reporting on its website a very narrow McCaskill lead, but the latest numbers--with just 71% reporting--show Talent up by 3 percentage points.
Later update: McCaskill back on top. With 80% reporting, she leads 49-48.