Obama and Clinton look to boost Biden without overshadowing him

President Joe Biden is hoping the star power of his Democratic predecessors, former Presidents Barack Obama and Bill Clinton, will shine a light on his campaign against another former president, Donald Trump, during a high-profile New York City fundraiser.

But although his last State of the Union before November’s general election addressed concerns about his age, his campaign is under pressure to make sure Biden is not overshadowed, particularly by his younger, more popular former boss.

The Biden campaign dismisses the idea that the president has an enthusiasm problem, citing expectations Thursday night’s fundraiser could raise more than $25...