Which president was it and what's the true story?

Question

There is a story about a US President who was accompanied by some friends. The story goes that they were all on horseback, but the president was behind them. Then, an old man who needed help waited till the president was passing by to ask for help although he did not know that the person he was asking for help was president. Afterwards, the president asked the old man why he did not ask his friends who all passed before for help, and the old man said that he knew, by the president good nature, that his request would be granted.
I have heard the story, but I don't know which president it was. Also, if anyone has a more factual version of the story, please share it with me.

Answer 1

Urban legend