Obama, closing out his final presidential trip to Asia, said his meetings with foreign leaders during the trip had illustrated that governing is "serious business" requiring knowledge, preparation and thought-out policies that can actually be implemented.
He urged Americans not to allow the "outrageous behavior" seen amid the campaign-season din to become the new normal.
"The most important thing for the public and the press is to just listen to what he says and follow up and ask questions to what appear to be either contradictory or uninformed or outright whacky ideas," Obama said.
Obama has endorsed Hillary Clinton and has said he plans to campaign full-force for the Democrat ahead of the November election.
More From This Section
Obama's remarks came at the end of a grueling nine-day trip that took him to Laos and China following US stops in Nevada, Hawaii and Midway Atoll in the Pacific Ocean.
It's the last of 10 trips Obama paid as president to Asia, where Obama lived as a youngster with his mother in Indonesia.
At the top of the list of unfinished business is the Trans-Pacific Partnership, a 12-nation free trade deal Obama helped broker.
That deal awaits ratification in the US Congress, where there is opposition from both parties. But Obama said he planned to do everything possible to persuade lawmakers to approve it this year.
With his presidency nearing an end, Obama's agenda has narrowed to a few key goals he hopes to complete before his successor takes over. Asked to acknowledge he wouldn't be able to fulfill his campaign promise to close the Guantanamo Bay detention center, Obama pushed back.
"I don't take these comments personally, because it seems as if this is a phrase he's used repeatedly, directed at the pope and others," Obama said of the slur. "I think it seems to be just a, you know, a habit, a way of speaking for him."
On his last day in Asia, Obama met with Indian Prime Minister Narendra Modi, whose help Obama is seeking to galvanize further action on climate change, especially among developing countries.
Obama said since his name is not on the ballot, there are
"But there is a lot about this election that has not been on the level. I'm going to level with you right now. The way campaigns have gotten, we've come to accept crazy stuff as normal. The strategy of just repeating attacks and outright lies over and over again.
"But it gets churned in social media and Facebook, and no matter how false they are, they just create this cloud of dust," he said.
"So I've had to bite my lip and just listen to some of the nonsense that's been said about Hillary. I know Hillary. I ran against Hillary. She worked for me. This is somebody who has dedicated her life to make this country better.
While Donald Trump and his developer dad were being sued by the Justice Department for denying housing to African American families, Hillary was going undercover from school to school to make sure minority kids were getting an equal shot at a good education.
"She has not stopped fighting. She has not stopped fighting for justice. She has not stopped fighting for equality. She has not stopped fighting for kids ever since," he said.
Clinton, he argued, will be a smart and steady President.
"She'll fight for equal pay for equal work. She'll make sure that we've got a higher minimum wage and family leave that's paid so people can afford to use it, and make sure that this economy works for everybody," Obama said.
"Unlike her opponent, she actually knows what's going on in the world. She's travelled around the world. She's respected around the world. She'll work her heart out to keep America respected and strong and safe.