Mr Obama is expected to deliver a similar message in another campaign speech in Cleveland on Thursday.
"He is a symptom, not the cause", Obama said, condemning what the sitting president has unleashed in politics.
According to a report on the reemergence of former President Barack Obama into the public square after giving a scathing speech attacking Donald Trump, White House insiders are anxious that Trump will now become obsessed with going after the former president.
"Even if you don't agree with me or Democrats on policy".
Obama touted the sevent candidates - Josh Harder (CA-10), TJ Cox (CA-21), Katie Hill (CA-25), Gil Cisneros (CA-39), Katie Porter (CA-45), Harley Rouda (CA-48), and Mike Levin (CA-49) - by name, casting them as people who understand how critical it is for Democrats to step up in 2018.
Obama also unloaded on the Republican Party, saying that it has become a home for the politics of "division, of resentment and paranoia" and that its members are abdicating their responsibilities by doing nothing "when the president does something insane".
Appearing in Southern California on Saturday, the former president took another swipe at his successor as he raised his profile campaigning for fellow Democrats to regain control of the House. "I don't mean to pretend I am channelling Abraham Lincoln now, but that's not what he had in mind, I think, when he helped form the Republican Party". The former president is also slated to campaign in IL and September later this month, and will headline a fundraiser for the National Democratic Redistricting Committee in New York City.
And in accepting Trump, Obama said, Republicans have abandoned many of their long-held guiding principles, like forgoing lower deficits in favor of tax cuts and maintaining a hard line with Russian Federation.
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Obama says "What happened to the Republican Party?"
There was no immediate reaction from Trump, who, in remarks to a crowd in North Dakota, took Obama's speech Friday in stride.
"We're supposed to stand up to discrimination", Obama said.
Obama ridiculed Trump for taking credit for economic gains that began under Obama's administration, and said Trump was exploiting cultural fears and economic anger that have grown in recent years amid societal upheavals.
Following a fiery appearance in his home state of IL, former President Barack Obama brought a softer tone Saturday to Orange County, California - a traditional GOP stronghold. In the other Orange County race, Gil Cisneros, a Democratic philanthropist and Navy veteran, is vying for an open seat created by retiring Republican Ed Royce. The Trump administration was under fire from Democrats for its response and handling of recovery efforts on the island.
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. And in a healthy democracy, it doesn't work.
"You desperately tried to defeat Trump and it didn't work", Pirro said.
Obama made mention of the death toll in Hurricane Maria which hit Puerto Rico previous year.
Last month, Obama released a first round of endorsements - 81 candidates up and down the ballot - and there will be a second round of endorsements and additional campaign activity in advance of the midterms, according to his office. "And they're not giving up until we have a Congress that sees your lives are more important than a campaign check from the NRA".