Interesting history on Landrieu - not that it matters.

[Moon Landrieu Ancestry]

[Joseph Landrieu, grandfather of Mitch and Mary and father of Moon, was born in 1892 in Mississippi. His race is given on the 1900 Census as Black. His race is given on the 1910 Census as White. His race is given on the 1920 Census as White. His race is given on the 1940 Census as White. Joseph’s father Victor Firmin Landrieu was French and came to the USA with his parents. Joseph’s mother Cerentha Mackey was born in Mississippi as the illegitimate child of a mixed-race black woman and an unknown father].

[It is through his great-grandmother Cerentha Mackey that Mitch Landrieu has black ancestry, although this is probably only a small fraction of his heritage]