Post-identity politics?
Billionaire Trump is not supported by billionaires
(he has the middle class and working poor)
Hispanic Cruz/Rubio are not supported by Hispanics
Female Hillary is not supported by females
Jewish Bernie is not supported by Jews / Old Bernie is not supported by old people
African-American Carson is not supported by African-Americans
I wouldn't say post-identity, I think it's more that the identities of candidates don't necessarily line up with the identities of their supporters. There's still clear appeals to identities, just not the ones you'd think.