WASHINGTON (CNN) - Democrat Barack Obama stepped up his efforts Tuesday to battle back against e-mails that falsely label him a Muslim, telling an interviewer the ongoing rumors were part of a "systematic political strategy."
"I think it's very important for people not to buy into the kinds of dirty tricks that we've become so accustomed to in our politics, and people need to understand I'm not and never have been of the Muslim faith," he told CBN's David Brody.
Related video: Obama confronts Muslim rumors
In e-mail messages that have been circulating as long as Obama has been a presidential candidate, the Illinois senator is said be a Muslim who refuses to recite the pledge of allegiance, and one who "joined the United Church of Christ in an attempt to downplay his Muslim background." In fact, Obama has never been a Muslim.
"I think that those who are of the Muslim faith are deserving of respect and dignity, but to try and feed into this fear-mongering and try to question my faith commitments and my belief in Jesus Christ, I think is offensive," Obama also said. "And I want to make sure that people are absolutely clear about what's going on with this, and if they get another one of these e-mails that they're deleting it and letting their friends know that it's nonsense."
Obama did not hypothesize who was behind the e-mails, but noted, "somehow they appear magically wherever the next primary or caucus is."
His comments are the latest in a heightened effort to beat back the Internet rumors ahead of South Carolina's Democratic primary Saturday.
In recent days, his campaign has launched a TV ad that quotes his now-famous 2004 speech in which he said, "We are one people, all of us pledging allegiance to the stars and stripes.” And in a new mailer to South Carolina Democrats – the latest in a months-long series of religious-themed messages in the state - Obama is called a "Committed Christian," who "felt a beckoning of the spirit and accepted Jesus Christ into his life." The mailer pictures the senator standing behind a pulpit, with an organ and a cross in the background.