Why isn’t Tulsi Gabbard President?

Tulsi Gabbard would seem to be the ultra electable politician. She is beautiful, the perfect age, tough, smart, and smack dab in the middle of American political opinion. And yet she is unlikely to be elected to anything because she is anathema to both parties. Is this a sign that a third party is in the offing? How bankrupt must a political party be to turn its back on a candidate like Tulsi?