Gǔwǎngjīnlái, zhízhèngzhě zuìdà de tiǎozhàn jiùshì yíngdé mínxīn.
Throughout history, a ruler's greatest challenge has been to win the hearts of the people.
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执政者 is formal/journalistic. For a particular leader use 领导人 (lǐngdǎorén); for a king/emperor use 君主 (jūnzhǔ); for the political party in power use 执政党 (zhízhèngdǎng).