Collins arranged for food from her home state to be served: University of Maine lobster salad, Fox Family potato chips, and Wild Maine blueberry pie.

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"How can you go wrong with a University of Maine recipe for healthy lobster salad?," she said. "I pointed that out to the president in keeping with the first lady’s initiatives."

But even though he was unable to eat, Obama did appreciate the spread.

"He remarked we had far better food than the Democrats do and I said that's because I was hosting," Collins said.

After his meeting with Republicans, Obama moved to the opposite side of the Capital, where he met with House Democrats.

As he walked through the Senate basement to go through the underground walkway to the House side, Obama pointed out the subway trains that take senators between the office buildings and the Capitol.

"Do I get to ride the train like I used to?" Obama, a former senator from Illinois, asked. "I love the trolley."