Imagine the benefit if the Federal tyrants in black robes did not arbitrary decide to rob every state of its republican senate 50 years ago. (Reynolds v. Sims, 1964)
Then Leftist urban areas would not be able to force the rest of the state to slavishly serve them.
Wikipedia's summary has this prophetic quote from Senator Everett Dirksen of Illinois who led an unsuccessful fight to pass a Constitutional amendment allowing unequal legislative districts.
Dirksen warned that "...the forces of our national life are not brought to bear on public questions solely in proportion to the weight of numbers. If they were, the 6 million citizens of the Chicago area would hold sway in the Illinois Legislature without consideration of the problems of their 4 million fellows who are scattered in 100 other counties. Under the Court's new decree, California could be dominated by Los Angeles and San Francisco; Michigan by Detroit.."
That is exactly what happen to CA!