Why are white liberals more liberal on average then nonwhite liberals?

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Probably becasue minorities, even if they happen to be more moderate or even conservative on certain issues, often feel alienated from the Republican Party as an institution, so they end up voting for and identifying with Democrats.

Basically this (the same applies to women, gay people, and some other groups to varying degrees), although the extent to which the premise of this thread is even the case is exaggerated. Sanders, for example, lost most minorities because he was weak on racial issues, not because they thought he was too left-wing.

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White liberals never had to deal with the difficulties of minorities in getting a job, in the legal system, and in their own jobs. See https://en.wikipedia.org/wiki/Racial_wage_gap_in_the_United_States

As of 2009, the median weekly wage for African American and Hispanic workers was about 65 percent and 61 percent that of White workers, respectively. Maybe it's easier to be very liberal when life is good, and you don't have as many worries as minorities.

What exactly do you mean by "liberal" in this post, and why would not having a job make it harder?