You understand that this has been a right wing talking point for ages, right? That the reason the black community isn't well off has been due to the increasing rate of single motherhood.
I firmly believe that one's standing in life, be it socially or economically, starts with the family. That is the ultimate foundation. If you are a child born of two loving, supportive and sacrificing parents... and they stress the value of hard work and personal accountability... then it is highly unlikely that you will be poor when you are an adult. No matter what color you are.
If you are born into a broken family, or lack adult guidance, or a proper adult role model... then you are way more likely to be poor. No matter what color you are.
If the democrats were truly invested in the advancement of blacks, or any group of people really, they would be stressing the importance of family over everything else.