Cash Crunch Squeezes Kennedy Amid Costly Fight for Ballot Spots

Robert F. Kennedy Jr.’s independent presidential campaign is spending heavily, amassing steep debts and resorting to layoffs as it becomes almost singularly focused on the costly effort of placing his name on state ballots.

The troubles, laid bare in federal filings and interviews with nine people with knowledge of the campaign’s activities, have left little money for events and other traditional campaign priorities, leading to a growing sense of alarm among some staff members and longtime supporters. Fund-raising has slowed, and the campaign has become reliant on Mr. Kennedy’s wealthy...