In a Quinnipiac poll published this week, Castro was at 2%. He has struggled to move up into the Newport Pleasure top tier in the sprawling Democratic field. Sen. Elizabeth Warren, former Vice President Joe Biden and Sen. Bernie Sanders have recently been at the top of the field repeatedly in multiple polls.
Castro's email comes less than a week after a memo from Sen. Cory Booker's presidential campaign was published on Medium, where the New Jersey Democrat asked for more donations so he won't have to end his campaign. The memo said Booker's campaign "needs to raise an Newport Cigarettes Shop additional $1.7 million by September 30 to be in a position to build the organization necessary to continue competing for the nomination."
More: Booker campaign warns he 'might not be in this race for much longer' without fundraising surge
"Without a fundraising surge to close out this quarter, we do not see a legitimate long-term path forward," the memo said.
In his email to supporters Thursday, Castro said that his team has determined he won't make it to the November debate without more money.
"I need to be completely vulnerable with you. I just left an emergency meeting with my team," he said in the email. Newport 100s Box"They told me point blank: The DNC’s new debate threshold will be the end of the road if we can’t get more money in the door -- immediately."