Singer Katy Perry performs before the arrival of President Barack Obama at a campaign rally, Wednesday, Oct. 24, 2012, in Las Vegas. (AP Photo/Julie Jacobson)
LAS VEGAS (AP) - Katy Perry's doing her best get-out-the vote effort: At a rally for President Barack Obama, she wore a tight white dress imprinted like a ballot, and a square box on her right hip filled in the names of Obama and Joe Biden.

Perry gave a free concert at a park in a historically minority neighborhood just northwest of downtown Las Vegas to screaming fans at about 9 p.m., the same time Air Force One landed at McCarran International Airport across town.

Obama later told the crowd, "I believe in you. I need you to keep believing in me."

The Las Vegas campaign event drew more than 10,000 people, according to fire officials and organizers, with long lines still on sidewalks during Perry's 30-minute performance before Obama arrived.

The singer opened with a rendition of Al Green's soul hit, "Let's Stay Together," and played five songs, including "Teenage Dream," before ending with a thumping bass drum version of "Firework."

Perry, who recently also played a free concert at an Obama event in Los Angeles, paused before the last song Wednesday to exhort people in the Las Vegas crowd to vote early.

"Don't wait. Go tomorrow," she said. "How many of you are 18 here? It's going to be your first time, right?"

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Obama urges end to NHL lockout on 'Tonight Show'

LOS ANGELES (AP) - President Barack Obama is urging the end to another sports labor dispute.

While taking questions from viewers on NBC's "Tonight Show" with Jay Leno on Wednesday, he was asked if he could pull any strings to end the NHL lockout.

Obama says: "Every time these things happen I just want to remind the owners and the players: You guys make money because you've got a whole bunch of fans out there who are working really hard - they buy tickets, they're watching on TV."

He adds: "You all should be able to figure this out. Get this done."

The president
In this photo provided by NBC, President Barack Obama appears on "The Tonight Show" with Jay Leno Wednesday, Oct. 24, 2012, in Los Angeles. (AP Photo/NBC, Paul Drinkwater)
sent a tweet last month urging the NFL and its officials to end their labor dispute.

Copyright 2012 The Associated Press.