On the eve of the rollout of his latest jobs plan, President Obama is appealing to his grassroots supporters for some campaign cash, and offering to personally sweeten the deal.

Two supporters who raise the most cash for Obama through the campaign’s online, social media fundraising tool by the end of September will receive a personal phone call from President Obama or Vice President Biden to a person of their choosing (Mom, Dad, Grandma), according to an  announcement on the campaign’s website.

“In 23 days, we face our next major reporting deadline as a campaign, and we have to keep up our momentum,” wrote the national finance director Rufus Gifford in a blog post.  The campaign is required to report its fundraising totals for July, August and September to the Federal Election Commission by Oct. 15.

“We’re shooting for 20,000 donations to grassroots fundraising pages by September 30th to hit our campaign goal,” Gifford said.

The initiative is the latest by Obama’s campaign team to invoke the spirit of competition to try and drive more dollars from donors. Earlier this year, contributors of $5 or more won a chance for “ dinner with Barack,” and last month, supporters who recruited 50 or more new volunteers were entered into a sweepstakes to attend Obama’s 50 th birthday bash.

The campaign has not disclosed how much those and other fundraising initiatives have raised, or their overall target for the third quarter. But officials have been lowering expectations for the summer fundraising period, suggesting they won’t match the $47 million raised in April, May and June.