Democrats would need to win at least 24 seats to gain a majority in the House, where at least 41 Republicans are planning to retire, resign or run for another office, according to an analysis by ABC News.

Control of one chamber on Capitol Hill would give Democrats the power to block the Republican agenda and use their majority power in the respective congressional oversight committee to launch investigations into the White House.

Other speakers at the rally included actresses Kelly McCreary and Lana Parrilla of ABC's \"Once Upon a Time,\" Carolyn Swords, of the WNBA’s Las Vegas Aces, and comedian Keegan-Michael Key.

Obama and the organization thanked the attendees for \"bringing the energy\" in a post-rally tweet on Sunday and asked them to get their loved ones to vote.

\"Thank you, Las Vegas! Now let’s get working to help our family and friends get registered to vote,\" Obama tweeted.

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