Dr. Mary Ellen Guffey: Use the subjunctive for conditions contrary to fact. I am not president.

Alicia Rosov: Because I will never, ever subject myself to what it takes to become president in this country. Ergo, subjunctive mood.

Rob Ault: I still use the subjunctive voice in both writing and speech, so I'd use "were" since I'm not the president. It's important to note that not every "if" construction is subjunctive, so "was" might be appropriate in some sentence.

John Russell: No comment on current situation though ;-]

Yocheved Golani: 'If' is a conditional word, and always takes 'were.'

Clyde Linsley: If I were president, I would also outlaw exclamation points and the use of the word "impact" as if it were a verb.

Charlotte Fox Luttrell: This is another easy one. "If I were president" is correct, because you are speaking in the subjunctive tense.

Carrie Garbas: Yes, yes, yes--please don't forget the subjunctive case.