(CNN) - Herman Cain's chief-of-staff, Mark Block, said on CNN Thursday night the campaign has raised more than $3 million since the beginning of October and reported 65,000 donors.
"We've actually doubled in a little over a month, and that's what we're seeing in our grassroots activism growth," Block said on CNN's "Out Front with Erin Burnett."
The figure represents a huge surge in the campaign's fundraising, and totals more than money raised in the previous three previous months combined.
From July through September, the campaign reported raising more than $2.8 million, which includes a $175,000 loan from Cain, according to the campaign's finance reports filed with the Federal Election Commission.
The spike corresponds with Cain's big leap in the polls during the last month. While he was hovering in the single digits until late September, he now finds himself at the top competing with former Massachusetts Gov. Mitt Romney in most national surveys.
Block hit back at criticism over Cain not being as active as other candidates in key early voting states, including New Hampshire and Iowa, while he spends time on a book tour across the South.
"I think when this is all said and done, you will see that we have one of the most strongest, widespread and deep grassroots organizations all across America," Block said, adding that the campaign has organizations in all 50 states.
Block made headlines earlier this week for starring - and smoking - in a web video for Cain's campaign. The video has since gone viral, with nearly a million hits as of Thursday night.
- CNN's Robert Yoon contributed to this report.
Gingrich builds staff in New Hampshire
Ron Paul raised more.
Ron Paul raised nearly 3 million in the span of 3 days with his black out event and not a word of this, but Cain raises 3 million in October and he gets a story on it. The media ignores Ron Paul.
Cain approach might not be the best initialy, but now he is showing he got what it take to challenge Obama who seems to be confused with every single steps his taken lately.
Say what you will about simple-minded Perry, but even this backbrush, knuckle-dragger had enough sense not to hide his wife from us.
The fact that he SHOULD'VE kept her under wraps based on what an "asset" she's turned out to be is besides the point.
Someone should tell Classless Cain to introduce his wife to America if he's really serious about his run for the presidency.
I don't think he is.
Obama 2012. Period. Seriously.