Washington (CNN) - President Obama's family may be out of town, but his supporters are certainly showing the love on his 49th birthday.
Volunteers with Organizing for America, the successor organization to Obama's 2008 presidential campaign group, are throwing 528 birthday parties across the country, according to the OFA website.
In addition to celebrating the president's milestone, the parties are aimed at recruiting new volunteers who will help "get more first-time 2008 voters back to the polls in November," the OFA invitation said.
OFA operates within the Democratic National Committee.
"The elections in November make this a particularly busy time for us," said Carol Sheffield, a community organizer for OFA in West Virginia. "We want to get as many people as we can to help."
Sheffield, who is hosting her own presidential birthday party at an OFA member's home in Buckhannon, West Virginia, is asking her party attendees to bring a cell phone to make voter contact calls during the party.
But she promises the party won't be all work.
"I'm just finishing up the icing for the cake," she said. "It's marble cake …we thought that was appropriate."
The first lady also joined in on the fun. In an e-mail, Michelle Obama asked OFA members to sign an electronic birthday card for the president by visiting the OFA web site.
"Together with other Organizing for America supporters - and me, Malia, Sasha, and Bo - we'll wish him a happy birthday and let him know that we're ready to take on the year ahead alongside him," the e-mail said.
David Plouffe, the architect of President Obama's 2008 campaign and now an outside adviser to the White House, also sent an e-mail to encourage OFA members to send the president a birthday message.
As of Tuesday morning, over 1.2 million people had signed the card, Plouffe said in the e-mail.