Question

add a comma or semicolon if needed. otherwise, submit the text without any additional punctuation. journalist horace greeley founded the liberal republican party and he ran for the u.s. presidency in 1872 but died before the election results were finalized.

Explanation:

The two clauses "Journalist Horace Greeley founded the Liberal Republican Party" and "he ran for the U.S. presidency in 1872 but died before the election results were finalized" are independent clauses. A comma - splice would be incorrect as it would join them with just a comma. A semicolon is appropriate to separate two closely related independent clauses.

Answer:

Journalist Horace Greeley founded the Liberal Republican Party; and he ran for the U.S. presidency in 1872 but died before the election results were finalized.