Who doesn't want to win the lottery or a sweepstakes? I think we have all had that "dream" at one time or another. What would we do? How would we spend the money? This is why so many people want to believe that there is a chance that they really DID win when they are contacted by scammers pretending to be with The Publisher Clearing House or other sweepstakes.
The scammers do not just send emails any more. Some are calling their intended victims directly. This is why it is important to protect information like your address and phone number. Do not post this information on blogs or open message boards.
Things that are still the same with this scam is that they will ask you to wire money to them, for legal fees or other reasons. Remember, if the lottery or sweepstakes is legitimate, they could deduct those fees from your winnings without you having to wire them anything.
Doing a Google search on any information that you have on the "sweepstakes representative" that contacts you is one way to try and check things out. Often the phone number that the call came from will be from another country, which is a dead giveaway that this is a scam.