Well he has a beard, and she has a daughter. Whether or not he is the sire could be debated.
You probably don't believe Michael Jackson is the father of blue-eyed Paris Jackson, or that Willy Clinton sired that Webb Hubbell lookalike Chelsea, or that the homosexual jug-eared muslim is the father of the lovely Shemalia and Jemalia.
It's pretty common for democrats to be unclear on matters of paternity.