Well I think that it doesn't matter if Obama is invited to personal check and count everybody's vote in Crimea. The election will not be acknowledged in the West regardless.
They will say:

1) It's not really a legal referendum in the first place
2) It was not carried out in a democratic fashion and/or ballot stuffing took place.
3) People were harassed and did not dare to vote according to their actual views.
4) The voting campaign was not fair, the other side did not get fair coverage.

Too bad there is no member from Crimea or Donetsk on the forum! Would have loved to hear from them. In the meantime I am reading extra carefully what everyone from Ukraine says..

What about this person, Pavel Gubarev? According to Wikipedia he is a nazi and oligarch. Does not appeal to me! But everybody in Eastern Ukraine seems to like him. What happened with him?