Finalists include Brooklyn, N.Y., Philadelphia and Columbus, Ohio.
Tea Party favorite drew applause from a crowd that included mega-donor Sheldon Adelson.
The potential '16 hopeful will keynote the University of South Carolina's winter graduation.
The Louisiana Democrat will take the field before Monday's Saints-Ravens game.
He retweeted at least a dozen tweets from random supporters urging him to run for president.
Hillary Clinton has a massive lead among Democrats.
Cameron Joseph 11/23/14 02:00 PM EST
Reid will try to maximize political benefits in advance of a tough reelection bid.
“I’m doing everything consistent with a run for 2016," he said.
"You go through personal hell," the Republican senator said.
Obama said candidates probably aren't "gonna be looking at me to campaign too much."