Joe Biden insists he still has a path to the nomination. Others have trouble seeing it.

Joe Biden insists he still has a path to the presidential nomination. Others are having trouble seeing it.

The former vice president was viewed as the field's frontrunner until voters started casting ballots. Now a disappointing fourth-place finish in the opening Iowa caucuses last week was followed by a disastrous fifth-place finish in the New Hampshire primary Tuesday. The collapse of his support into single digits will not only make raising money and rallying supporters more difficult. It also raises questions about whether his campaign can survive until the...