It's pretty basic and was developed by the Urban League first, and later adopted by the NAACP and various black oriented voting rights groups.
First off, let's round that to 7%. We'll make blacks 7% of the total population. Since it's California, they might well have gotten the vote earlier than in the South ~ but there they are 7% of the total population.
If 40% of the population turned out to vote ~ in California elections ~ and split roughly 50/50, you'd have just 20% of the population voting Democrat and 20% voting Republican. A few votes here and there could sway the whole election with a close division like that.
If 100% of adult blacks showed up to vote, that'd be about 2/3 of their total population, or 4.3% of the total vote, or, roughly nearly 25% of the Democrat vote.
You might want to read http://elections.gmu.edu/Turnout_2008G.html which shows that total voter turnout in California is about 60% of total possible voters.
A 25% share of the statewide party vote definitely gets you positions in the party power structure as well as delegates to the conventions, and members of the legislature! This is particularly so if they live concentrated in a few areas where you have heavy Democrat party voting by other groups ~ unions, teachers, mexicans, etc.
So, yeah, if you didn't have blacks voting Democrat in California they'd be marginalized into near oblivion! Republicans would always win California elections if there were no black voters, and that's not just for the top offices, but for most of the offices almost everywhere but Compton, San Fran, Los Angeles and a number of really hard core Democrat cities.
That's the way the process works in the East and in Illinois and in California!
Would you rather be a little fish in a big pond, or a big fish in a little pond?
HuH? I didn’t want to know if whatever you are rambling about is possible, I already know that the 6.6% of the black population of California did not take it out of the republican column and turn it into the democrat stronghold that it is today, just like that didn’t happen in Hawaii, or Vermont, or Massachusetts, or why they can’t control Mississippi even though it is the blackest state in the nation.
Your post about blacks being “40% of the Democrat vote overall”, and that “Blacks are today THE DEMOCRAT PARTY itself.” just isn’t accurate.