Final answer:
The 2000 election was heavily influenced by a contested Florida election, leading to George W. Bush's victory over Al Gore.
Explanation:
The key issue that mattered most to voters during the 2000 election was the outcome of a contested Florida election, which ultimately led to George W. Bush winning over Al Gore due to a Supreme Court ruling. This election was one of the closest in many decades, with uncertainty over the victor centered on Florida's electoral votes.
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