There are just 21 days left until California voters decide whether their state becomes the first in the nation to make marijuana legal for all adults. And as the campaign enters its final stretch, support for ending marijuana prohibition in California continues to pour in from all kinds of sources. Late last week, the League of United Latin American Citizens of California (LULAC) – part of the nation’s oldest Latino civil rights group – became the latest statewide organization to endorse Prop 19.…