CHARLOTTE, N.C. President Barack Obama is telling supporters he regrets having to move his acceptance speech indoors, but says he couldn't risk their safety given the possibility of severe weather.

Obama spoke on a conference call to people who had tickets to the outdoor event. The indoor arena where Obama will speak Thursday night holds far fewer people.

The president told supporters he wouldn't let a little thunder and lightning get us down. He says his team will do everything it can to get those supporters into other campaign events between now and Election Day.

Earth, Wind & Fire performance cancelled

DNC officials confirmed that Earth, Wind & Fire will not perform tonight due to the change in venue.

The band's stage set-up was too big for the Time Warner Cable Arena space, according to officials.

Democratic aides also said that the decision to move the event indoors will incur cost losses but would not estimate a total amount.

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