saving related objects in overridden save method on model

I have these models:

class Widget(models.Model):
name

class Person(models.Model):
requested = models.ForeignKey(Widget, related_name='requested')
considered = models.ManyToManyField(Widget,
related_name='considered')

def save(self, *args, **kwargs):
if not self.considered.filter(id=self.requested.id):
self.considered.add(self.requested)

I'm trying to make sure that when a Person has requested a widget,
that value automatically gets selected added as a considered value
too. I find that this does work if I do this when no considered
values are selected:

>>> p = Person.objects.get(pk=1)
>>> p.save()

The relationship gets saved. But when I attempt in the Django admin,
the two fields are not sync'd. Any reason why this would be?

Thx.

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