LAS VEGAS (AP) — President Obama is heading back to Nevada this weekend for another campaign stop.

The president's campaign says Obama will be in Las Vegas on Sunday and attend a "grassroots event." Details were not immediately released.

It will be Obama's ninth appearance in Nevada this year.

Nevada is a key battleground state in the upcoming election. Early voting begins Oct. 20.

Republican presidential nominee Mitt Romney campaigned in Las Vegas on Friday.