American President Barack Obama has said that he is least bothered about rumours of his birthplace or faith and blamed his conservative enemies for perpetuating misinformation and an online campaign myth that he's a Muslim.

After marking the fifth anniversary of Hurricane Katrina, Obama said in an interview on Sunday in New Orleans that there's "a network of misinformation that in a new media era can get churned out there constantly".

I cannot achieve anything "If I spend all my time chasing after that", he said when asked why so many people were uncertain about something as fundamental as his faith. "I can't spend all my time with my birth certificate plastered on my forehead", the US President said.