Campaign fundraising reports released Thursday show Fiorina has spent $4.2 million in the period from April 1 to May 19, thanks in large part to campaign loans made from her personal fortune.
Fiorina and Campbell are in a statistical tie in the latest poll, with DeVore trailing.
Fundraising from outside donors was much closer. Campbell took in $989,000, while Fiorina raised $909,000. DeVore brought in slightly more than $512,000.