Not voting in the upcoming presidential election is equivalent to voting for Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE, President Obama said Wednesday in a string of swing-state radio interviews.

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Calling in to a radio station in Las Vegas, Obama encouraged listeners to register to vote and support Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE in November.

"If you paid attention to the presidential debate and then last night, the vice presidential debate, it is very clear that you have a really stark choice here," Obama said on Old School 105.7's "The Zenja Dunn Show."

Obama's call was one of six interviews he did Wednesday with hip-hop and R&B stations in swing states as part of a voter registration push.

Obama also did interviews with stations in Pennsylvania, Florida and Michigan, reiterating his support for Clinton and opposition to Trump, the Republican nominee.

"I just don't think [Trump] is fit for office and doesn't have the temperament or the background or the policies that would make sure that folks in Nevada and across the country are doing well," Obama continued.

"The main thing I'm trying to emphasize to people is if you don't vote, that's a vote for Trump. If you don't vote, that's a vote for reversing the policies that have gotten us out of the worst recession in our lifetime. If you don't vote, you're voting for a much more unstable world."