Question

Why did rival candidates become president and vice president ?

Answer 1

I believe they did that because that was the election process in the original Constitution. They changed it because of the 12th amendment (ratified in June 1804. Just in time for the next election)

Answer 2

it's a political move.

Step-by-step explanation:

they can win over other members of their party who may have supported the VP pick by teaming up with them even though they ran against in their primary.

it's a way to maximize voter turn out for their base.