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<<Barrack Obama argued precisely for this role in his first campaign.>>
No, he didn't.
Then-Senator Obama did point out that the United States had fought two wars which the Congress neither approved nor paid for; he did pledge to extract the United States from them.
But: he did not disparage our allies, weaken our alliances, or suggest that the United States should withdraw from a leadership role in the community of nations. He did not praise and cozy up to dictators, despots and "strong men."
In 2008, Barack Obama had more political experience than Donald Trump had in 2016, but not a lot more. What really distinguishes Obama 2009 from Trump 2017 is that Obama came to the presidency as a student of history, politics and government; in short, Obama brought competence to the job.