Sentence "They elected her to be the president"?

[Nessie]

Hi,
Which of these are correct:

1/ They elected her to be the president
2/ They elected her the president
3/ They elected her as the president.

=> I think 1 is correct and 2 is incorrect, but I'm not sure about 3. By the way, is there any other way of expressing the idea?

Many thanks.
Nessie.
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Pamela]

Your second sentence is Ok to me.

They elected her president.

[Nessie]

Thanks Pamela, and what about the others?
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...

[Nessie]

Hi, could anybody please help me?
_________________
... something we never have again, I know... I guess I really really know..

Sorry seems to be the hardest word...