Eight out of forty-seven vice presidents (or 17%) reached immortality as "accidental presidents" either through death or through resignation of the sitting president. Many of them took an independent course from the running mate they replaced leading to nation-strengthening or nation-weakening decisions.
Out of the vice presidents that have ascended to the highest office, two became great presidents (Teddy Roosevelt and Truman), two were about average (Arthur and Ford), one was a wild card (Lyndon Johnson), and four have been among the worst presidents (Tyler, Fillmore, Andrew Johnson, and Coolidge).
What other vice presidents-turned-presidents could have altered American history as much as a Roosevelt, Truman, Fillmore or LBJ?
I had many vice presidents worthy of discussion, but I thought these seven inspired the most interesting "what-if" scenarios. As a matter of propriety, I will not include the presidencies of any living presidents. It will be up to the reader to ponder a Quayle or Gore presidency.
Enjoy the slideshow.