There were 4 people sitting in a row trying to win $50 from a riddle.

The one in front was wearing a red hat.
The second from the front was wearing a blue hat.
The third from the front was wearing a red hat.
The last was wearing a blue hat and was blind-folded.

Each of them was informed that they were all wearing a hat, the last person was blind-folded and that there were 2 red and 2 blue hats. If they can guess the color of their hat, then they win the prize.

There was a long silence, then one of them guessed the color of his hat correctly. Who was it?

(Note that they can only see the person in front of them and are not allowed to turn around and see behind them.)