Martin Van Buren
The Democratic party can trace its foundations back to Martin Van Buren. Granted, it has changed quite a bit since Van Buren helped to found the party, but with his 133.4 IQ, he had the intelligence to help get the party set up. Not to mention, his knowledge served him well as he was admitted to the bar before the age of 14.
He was the first president born after the independence of the US from the British Empire. He was born to a family of Dutch Americans and was the only President who spoke English as a second language.