I have a Django site in which the site admin inputs their Twitter Username/Password in order to use the Twitter API. The Model is set up like this:

class TwitterUser(models.Model):
screen_name = models.CharField(max_length=100)
password = models.CharField(max_length=255)
def __unicode__(self):
    return self.screen_name

I need the Admin site to display the password field as a password input, but can't seem to figure out how to do it. I have tried using a ModelAdmin class, a ModelAdmin with a ModelForm, but can't seem to figure out how to make django display that form as a password input...