Final answer:
The quote that BEST supports the author's main claim is: 'In 2010, the U.S. Supreme Court ruled that corporations could give unlimited sums of money to political campaigns.' This quote supports the author's claim that huge companies with lots of money can buy our elections.
Step-by-step explanation:
The quote that BEST supports the author's main claim is:
'In 2010, the U.S. Supreme Court ruled that corporations could give unlimited sums of money to political campaigns.'
This quote supports the author's claim that huge companies with lots of money can buy our elections. The ruling by the U.S. Supreme Court allows corporations to make unlimited contributions to political campaigns, which gives them significant influence in elections.