Democratic presidential candidate Pete Buttigieg was celebrated in the media for his skyrocketing campaign, but a new poll shows he has an Achilles' heel among a very influential demographic.

The Post and Courier-Change Research Poll shows that although front-runner Joe Biden enjoys enormous support from the African American community, Buttigieg has none at all.

The openly gay South Bend, Indiana, mayor has zero percent support among African Americans.

Biden has 58 percent support in the demographic, while Sen. Bernie Sanders (I-Vt.) is in second place with 15 percent support among African Americans.

California Sen. Kamala Harris (D) comes in third with 12 percent support among African Americans.

South Carolina is seen as a pivotal state for the primary as it comes early in the race, and can catapult an ailing campaign into the forefront. But without support from African Americans, that seems very unlikely for Buttigieg.

Buttigieg was criticized for uttering the phrase, "All Lives Matter," which later came to be seen as a rebuttal to the slogan of the "Black Lives Matter" movement. He apologized for that gaffe and promised never to say the phrase again.

In a recent CNN poll, Buttigieg garnered 47 percent support to the president's 44 percent support.

Here's more about Buttigeig's weakness: