"He is just capitalising on resentment that politicians have been fanning for years".
"I am absolutely confident these candidates are going to win", Obama said to a cheering crowd at the Anaheim Convention Center, surrounded by a bevy of congressional hopefuls.
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On Friday, Obama gave a speech at the University of Illinois Urbana-Champaign to urge young people to vote.
Earlier this week, an unnamed White House official penned a New York Times opinion piece, claiming the president's worst impulses were tempered by "adults in the room", who ensured he did not act to the detriment of the United States on issues such as foreign policy.
Trump, asked about that speech during a trip to North Dakota, quipped that he had watched it but fallen asleep. "Today is a different role", Obama avoided mentioning Trump by name this time, but said he wanted to "highlight the extraordinary group of candidates" he was endorsing.
He also issued a critique of his successor, President Donald Trump, attacking his policies and calling attention to Trump's tendency of pressuring the Justice Department.
"President Obama believes the solution to our long-term challenges can be best addressed when we all fully participate in our democracy". And who say to themselves.
The former U.S. president has been back on the campaign trail as he bids to help fellow Democrats regain control of the House in November.
In a nod to the turbulence of the past week - which saw allegations of a secret "resistance" working inside the White House - the 57-year-old Obama poured scorn on the idea that "everything will turn out okay" because some of Trump's staff are secretly ignoring the boss's orders. "That unfortunately has been a spiral that we have been on for the last couple of years". But nothing will get done if this generation doesn't vote, he added.
"You happen to be coming of age", Obama told students at the University of IL at Urbana Champaign.
During his speech, Obama highlighted the seven Democratic candidates now running in the region and in highly contested counties.
Republicans say they aren't concerned.
"By the time I left office, household income was near its all-time high, and the uninsured rate hit an all-time low, poverty rates were falling", Obama said.
"When you hear how great the economy's doing right now, let's just remember when this recovery started", he said. "We've seen basic norms and principles that have served us well for decades increasingly violated", Obama said.
Obama also praised venture capitalist Josh Harder in his bid to unseat four-term Republican Jeff Denham, and T.J. Cox, who is challenging David Valadao in a district where Democrats hold a 17-point advantage in voter registration.
"As a fellow citizen, not as an ex-president but as a citizen, I'm here to deliver simple message and that is that you need to vote because our democracy depends on it", Obama said, according to Politico.