Do the fortunate have a moral obligation to help the unfortunate?

[t3mporary_126]

It would be interesting if everyone with money gave their $1, euro, or etc to any charity program at one day of the year. Perhaps there is such a holiday for the US, but I haven't heard of it.

Crap my post is off topic. 

On topic: I guess the fortunate should help. But to what extent, I'm not sure.