Incumbency gave him a staggering advantage. In 30 years, Mr. Biden never encountered a serious threat to his office. His re-election fight against former President Donald J. Trump is shaping up to be the opposite of those long-ago Senate campaigns: travel-intensive, nasty and close.
A rival is, for the first time with him atop the ticket, forcing him to make a compelling case for his return. Mr. Biden has been described as a strong incumbent who was widely liked in Delaware, and much quicker on his feet during debates and candidate forums than the president they see today.
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