Obama urges Americans to vote: 'This moment is too important to sit out'
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Former President Barack ObamaBarack Hussein ObamaCampaign staffers sue Illinois Dem governor candidate over alleged racial discrimination Bipartisanship is a greater danger than political polarization GOP group makes late play in Iowa seat once seen as lost MORE on Tuesday urged Americans to vote in the upcoming midterm elections, writing on Twitter that "this moment is too important to sit out."

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National Voter Registration Day, a holiday recognized on the fourth Tuesday each September, was created to increase awareness of voter registration opportunities for voters who otherwise might not register.

Ahead of November's midterm elections, Obama has reemerged in the political spotlight. He burst onto the campaign trail earlier this month, giving a speech at the University of Illinois in which he offered a blistering rebuke of President TrumpDonald John TrumpTrump renews attacks against Tester over VA nominee on eve of Montana rally Trump submits 2017 federal income tax returns Corker: Trump administration 'clamped down' on Saudi intel, canceled briefing MORE and Republicans who enable him.

“I’m here today because this is one of those pivotal moments when every one of us as citizens of the United States need to determine just who it is that we are, just what it is that we stand for,” Obama said at the time.

Obama also campaigned for several Democratic House candidates during a trip to California, where he took veiled shots at Trump and told a crowd that "if we don’t step up, things can get worse."