If you don't think one of these groups can be elected President even now note the year when you think their election will be possible and feel free to add any additional demographics.
Roman Catholic- 1952
Mormon- 1960
Jewish- 1980
Muslim- 2040
Buddhist- 2030
Atheist- 2050
Woman- 1976
Unmarried But In Sexual Relationship- 2000
Polygamous- Never
Homosexual- 2035
Transsexual- 2050
Black- Maybe 1988 or 1992 ? I figure you would need at least 2 + decades after the civil rights movement to cool down racial tensions.
Hispanic- 1976
Asian- 1988
Native American- 1988
Disabled-
Has Depression-
Has Asperger's-