Gerald Ford

Gerald Ford managed to become president without ever having been elected.

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White House Biography
From the official White House site

The American President: Gerald Ford
Another finely detailed biography

The History of the Presidential Election
EVERY election, from George Washington to the present. Which political parties have come and gone? Who has been elected more times than anybody else? Who were the "Know-Nothings"? All these and more are answered in this expansive yet easy-to-read article.

The Election of 1976
Ford narrowly lost to newcomer Jimmy Carter.

Watergate
The break-in that brought down a president

The Vietnam War
Ford presided over the end of the war.