More than 5 million Americans could be affected by the new voting rules, according to an analysis by the Brennan Center for Justice at New York University. These restrictions — including photo ID requirements, proof of citizenship to register voters and shorter windows for absentee and early voting — fall heaviest on young, minority and low-income voters, the analysis said.(...) Larry Sabato, a political analyst at the University of Virginia, said that most polls show Obama should be able to win a large majority of the black vote similar to 2008, and the drop-off in support that some pastors predicted has not materialized. The new voter-ID laws, however, present a wild card for Obama, who will need strong black voter turnout to win Florida and Virginia, Sabato said."The question is how many voters end up being discouraged or eliminated on account of the tougher voter-ID laws," Sabato said. "That remains the great unknown for Obama."Meanwhile, the Obama campaign has launched efforts on the ground and through its website gottavote.org to educate voters about voter-ID law changes in the pipeline.Edith Childs, an Obama campaign volunteer in South Carolina, said she has been reminding voters not to wait until the last second to get up to speed on the changes.Childs, from whom Obama borrowed his 2008 campaign call-and-response cheer "Fired up, ready to go," said the message concerning voter ID is simple: "You got to be prepared and get ready now for whatever new rules are coming our way."