But, Obama added, when there is a vacuum in democracy, "other voices fill the void".
"This is a consequential moment in our history". "And the fact is that, if we don't step up, things can get worse". But the good news is in two months, we have a chance to restore some sanity in our politics.
President Donald Trump this week criticized the attorney general for prosecuting two Republican congressmen, saying it will hurt the party in the November elections. "The biggest threat to our democracy is cynicism".
Obama argued that, "We are supposed to stand up to discrimination and we are sure as heck to stand up clearly and unequivocally to Nazi sympathizers". "The biggest threat to our democracy is indifference".
Obama touted his own administration's record in the aftermath of the Great Recession and rebuked Republicans for calling job growth and economic expansion now a "miracle".
Democrats, hoping to build on their 39-14 advantage in the state's congressional delegation, are eyeing Republican seats in districts that Clinton won in 2016.
The midterms in November will give Americans the opportunity to "restore some sanity in our politics", Obama said. "It's radical. It's a vision that says our protection of our power is all that matters", Obama said. "He says 'people feel unsettled, people feel scared", and they're anxious about their children's future.
He also criticised Mr Trump's response to the violence a year ago at a white nationalist rally in Charlottesville, Virginia, that resulted in the death of one person. Following a February 14 massacre at the school, survivors called on politicians to refuse to take money from the NRA.
The speech, which lasted more than an hour, was among Obama's first major forays back into the political arena.
Serena Williams Fined $17000 For US Open Controversy
She was hit with another $4,000 fine for being warned for coaching and $3,000 for breaking her racket. In Sunday's statement, Simon said the WTA believed coaching should be allowed across the sport.
Former President Barack Obama issued a scorching critique of his successor Friday, blasting President Donald Trump's policies and his pattern of pressuring the Justice Department.
He did not mention Mr Trump by name during a 20-minute speech in the key Southern California battleground of Orange County, but the allusions were clear.
Obama, accusing Trump of "capitalizing" on "fear and anger" asked "What happened to the Republican Party?".
"You desperately tried to defeat Trump and it didn't work", Pirro said.
Pirro then told her audience to not listen to the many Trump administration officials who have complained about the president's incompetence and poor character in a variety of mediums. The DCCC is the House Democrats' campaign arm.
Obama's appearance on behalf of Congressional candidates upset Vice President Mike Pence. "And I'm happy he wants to do it again".
Cox, Democrats' nominee in CA-21, said that optimism was misplaced, and action necessary.
The former president, who was accepting an ethics award from the school, said voting in this year's midterm elections was the antidote to stopping the fear and division that Trump has stoked.
He also pointed out, in reaction to Obama's invocation of Fox News, that even though the former president never called the network the enemy of the people, the targeting of reporter James Rosen. We can march, we can rally, we can put signs up.