Final answer:
President Clinton's main idea about free trade emphasizes its extensive benefits for economic growth and the need for protective measures to counterbalance disadvantages for some sectors.
Step-by-step explanation:
The main idea that President Clinton communicates in his quotation is that free trade is broadly beneficial, supporting economic growth and overall advantages for countries that engage in it. However, it's important to acknowledge that trade can also create winners and losers, necessitating measures to mitigate negative impacts on certain sectors or individuals within an economy. Trade deals and policies should ideally address these concerns, ensuring that not only are there winning industries but also protections for workers and the environment, to prevent a 'race to the bottom'.