Do you know who I am

Mr. Marsh was a senator in the government. One day he was driving to a town to make an important speech, when he stopped at a small restaurant to have some coffee. When he saw that the restaurant had some nice fresh rolls, he asked the waitress for one, and she brough it. Then he asked for some butter and jam, and she brough a very small serving of butter and a very small jar of jam.
"I'd like some more jam, please," Mr.Marsh said.
"I'm sorry," she answered, "but we only give one serving of butter and one jar of jam with each roll."
Mr.Marsh began to get annoyed. "Do you know who I am, young lady?" he said. "I'm the state senator."
"And do you know who I am" the waitress asked.
Mr.Marsh was suprised and said, "No'
"Well," she answered. "I'm the person who gives out the jar of jam."