I too had received several of these calls on my caller ID with no message. It appeared on the caller ID as "Illinois" which seemed odd. I did some research and found the number listed in an individual's name. I also contacted Democrats Abroad as I had seen this reported as Obama's campaign number and staff were trying to verify donations from Americans abroad and asking for passport numbers. Dems Abroad stated that it was a legitimate call. If they call again and I am home, I will answer yet I still find it a bit odd that they call from a number that is not a campaign number and that they would ask for the info over the phone when they have all of our e-mail addresses and could provide a secure link for us to provide this info??