What happened in 1998 that caused Clinton’s approval ratings to peak and then level off to about 60%, the highest ratings of his presidency?

In 1998, the House of Representatives impeached President Bill Clinton, and the Senate later acquitted him. The impeachment proceedings drew public attention and coincided with a rise in his approval ratings, which then leveled off around 60%. Signing NAFTA and losing control of Congress did not happen in 1998.

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