Should Obama end his campaign to save the Democratic Party and insure a Democrat presidency?

Obama won the majority of his support and delegates in the early primaries before the media and the voters learned who his was and the controversial people he's ociated himself with. Now he is in the lead for the nomination but has alienated much of the party base, and the majority of the working cl, white, and latino voters. He may still be able to pull out the nomination, but in the process he has made himself unelectable to the large number of white voters (and black voters only amount to 12-15% of the general population). If Obama is the nominee he can't win the presidency now and his nomination will offend a large portion of the traditional democrat bases. But if Hillary wins the nomination by the superdelegates, it will offend the black voters. Whichever candidate becomes the nominee a large portion of the party will be insulted. Obama can't win working cl swing votes so it makes sense that he should withdraw and save the party.