In no other election did the african-american vote have such a profound impact as barack obama's breakthrough election of 2008.

correct answer is in Barack Obama's breakthrough election of 2008

Explanation:

solution

impact of African American vote in other elections is compared with Barack Obama's breakthrough election so

Perfectly compares the impact of African American vote in other elections with impact of African American vote in Barack Obama's breakthrough election

as parallelism and comparison

so correct answer is in Barack Obama's breakthrough election of 2008

answer; limbic system;