COLUMBIA, S.C. — Overheard Friday night from the lead singer of a cover band playing at Doc’s Gumbo Grille:

“Don’t stay out too late tonight; you all have to get up early in the morning and go to the polls.”

The polls have been open for more than three hours, and they close at 7 p.m. All the networks and pundits are already out there, conducting exit polls.

Here’s the latest from the Reuters/C-SPAN/Zogby poll, conducted the past two days.  

Obama has shored up his lead against Clinton, which had dropped a few points this week. He now has 41 percent of likely voters, compared to Clinton’s 26 percent. Edwards has 19 percent, while 10 percent haven’t decided.

This telephone tracking survey included 816 interviews with likely Democratic voters and carries a margin of error of +/- 3.4 percentage points.