Why is this test for lower case strings failing?

// Created by John on 08/23/2015

//set correct answers to zero
var questionsRight = 0;

// ask at least 5 questions
var currentPOTUS = prompt('Who is the current President of the US?');

// Testing - this string shows up in the log
console.log(currentPOTUS);

//Testing the answers set to lower case

if (currentPOTUS.toLowerCase === "barack obama" || currentPOTUS.toLowerCase === "obama") {
    console.log(currentPOTUS.toLowerCase); // doesn't log
    console.log(currentPOTUS); // doesn't log
    questionsRight++;
}

// Provide a final message after the quiz letting the user know the number of questions he or she got right.

document.write('You got ' + questionsRight + ' questions right.');

// Rank the player. If the player answered all 5 questions correctly, give that player the gold crown.
// 3 - 4 is a silver crown; 1- 2 is a bronze crown and 0 is no crown at all.

if (questionsRight === 5) {
    document.write('You are hearby awarded a gold crown!');
} else if (questionsRight >= 3) {
    document.write('You are hearby awarded a silver crown!');
} else if (questionsRight > 0) {
    document.write('You are hearby awarded a bronze crown');
} else {
    document.write('You didn\'t win a crown, but thanks for playing!');
}