The relationship between [to elect, to ,and as]

Hi,

In these quotations, I give my opinions and understanding.

Please right me and thank you for your assistance.

1. He has been elected to President.

(To emphasize an election has held and he is the President elect. And [to] means reaching to)

2. The voter have elected him President.

(This sentence has an omission of [to] and the original is [The voter have elected him to President.] the meaning is The voter have elected him according to the condition of President in the mind. and [to] means according to)

3. They elected a President.

(Only states a holding of a President was made.)

4. They elected him as President.

(= Their electing him was considered as the condition of President in the mind.)