Hillary Clinton's candidacy has revived an old controversy in a new way: presidential third terms. It is, as one historian explains, a controversy as old as the nation itself.
In 1872, free traders split with the young Republican Party, ran a third-party candidate against Ulysses S. Grant and sparked 100 years of GOP protectionism. Is history repeating itself?
Candidates beware! History suggests that book writing presidents are not necessarily the best presidents.