I wish I could share your optimism. Hillary Clinton is an awful person and terrible candidate. If not for Trump she would have won.
None of these contenders are any better. Besides the Democrat Party is starting to feel the affects they have sown for all these years, tribal factions within their own party. Blacks would not be compelled to vote for Biden or Sanders. Black men are less likely to vote for Lizzie Warren and even less likely to vote for Buttigieg. Hispanics are moving more towards the Republican Party, and they too have issues voting for women or homosexuals.