U.S. Sen. Amy Klobuchar took the stage just before 10 p.m. as the crowd swelled to hundreds.
"We are showing the country again that Minnesota knows how to vote," she said, as Dayton jumped out to an early lead.
Klobuchar listed states where it looked like Democratic Congressional candidates did well, like Connecticut, West Virginia and Pennsylvania.
She made a pointed crack at Delaware Senate candidate Christine O'Donnell, a Republican tea party favorite who lost her race. O'Donnell famously raised eyebrows when she said she briefly dabbled in witchcraft.
"Thanks to the voters of Delaware, I won't be serving with a witch," Klobuchar said to cheers. "The word is the witch has melted."
Klobuchar also extended a hand to Republican colleagues in the Senate, new and old.
"Let's not just throw flames," she said, "Let's work together for the people of this country."
As Klobuchar spoke, DFL House Speaker Margaret Anderson Kelliher, who lost to Dayton in the primary, sat at a table in the opposite corner of the banquet hall for an interview on a local AM radio station.