From this point on the President can make anyone under him drink. The object of the game is to get rid of your cards first and be the President. This alerts the other players that you are going out after this card. Of you throw a four it is a free card. It doesn't count as anything and is an automatic social.
All players drink on a social, and the person who through the last card leads off.
Which means he can make anyone on the table drink. Or you can simply hold it up in the air and let them fight for it. Teams line up across the table. Each member of the team has a cup of beer in front of them. The first 2 members of each team start by chugging their beers.