Assuming Franklin Pierce isn't available for whatever reason, who becomes the nominee and what be the effects of them becoming President?
Marcy was the other candidate that gained support towards the end before everyone moved to consolidate around Franklin Pierce. If Marcy had won, the Presidential Succession Act of 1792 might've been triggered (William R. King dies in 1853, Marcy dies on July 4th, 1857 so he could die sooner due to the pressure of the presidency).William L Marcy?(Who could best, after all, beat a Mexican war hero than the supervisor of our armed forces?)