But top brass at '21' scoffed at their rival, just three blocks away.
"We've always been an American restaurant," insisted '21' general manager Brian McGuire. "I've always thought of the Four Seasons as being a Continental restaurant -- I'm not sure when they got all American."
As for the Four Seasons' claim that 99 percent of staffers voted for Obama, McGuire jeered, "Ask Julian who that 1 percent is . . . you might find out it's him."
The '21' Club, a stuffy former speakeasy with a conservative "no jeans" policy, has fed every sitting president since Franklin Delano Roosevelt -- until George W. Bush broke the 72-year streak.
The Four Seasons, a white-linen dining hall established in 1959, started its own presidential run with John F. Kennedy.
Now both restaurants are asking powerful patrons to help them.
When US Sen. Richard Durbin, who represents Obama's home state of Illinois, dined at '21' Monday, restaurant staffers approached him as he was leaving and explained the historic importance of a presidential visit.
Durbin agreed to help. "The senator said he would pass the message along to the president, and I'm sure he will," a Durbin spokesman said.
The Four Seasons is also recruiting power lunchers with political connections for help.
"We've been talking to Democratic fund-raisers who eat here, who helped [Obama] get elected, to see if they can get him to come," Niccolini said.
The White House said it does not comment in advance on Obama's dining schedule.
"You never get a lot of notice when a president comes in," said McGuire. "They'll make a reservation under a different name, then an advance team will come scout the area."
Still, McGuire's ready for the call whenever it comes -- and he's confident he'll get one before Niccolini.
"The cars on 52nd Street head westbound, so you have to pass '21' before you get to the Four Seasons. Chances are the president will stop here first."