The Associated Press examined political contributions over a 10-year period by the people who have been major contributors to advance school choice measures such as public charter schools and programs to use taxpayer funding to pay for private school tuition.

Some key findings:

— Forty-eight individuals or married couples donated at least $100,000 from 2000 to 2016 to support statewide ballot measures advocating for the creation or expansion of charter schools or taxpayer-funded scholarships that can be used for K-12 private school tuition.

— Those contributors account for more than three-fift...