Hillary Clinton needs a big win in Pennsylvania on Tuesday if she is to raise enough cash to keep her campaign on the road, according to election analysts and a breakdown of her own filings to the Federal Election Commission.

Mrs Clinton, who had just $8.6m (€5.4m, £4.3m) of cash on hand at the beginning of the month compared with $42.5m for Barack Obama, has been spending an average of roughly $1m a day in the past few weeks, according to independent estimates.