The Barack Obama presidential campaign has tapped Apple’s iPhone to help deliver news and information about the candidate. It’s also giving Obama’s supporters a new way to help swing the campaign to Obama’s favor: a Call Friends feature organizes and prioritizes contacts by key battleground states, making it easier to place grassroots political calls. “Not everyone can take time out of their busy schedule to go down to their local campaign office to do four hours of campaign phone duty,” said Raven Zachary, project director of the Obama ’08 application.