PHILADELPHIA -- Tim Kaine, the son of an ironworker born into a non-political family in Minnesota 58 years ago, delivered the most important speech of his career Wednesday night as he introduced himself to the country as Hillary Clinton's running mate and vouched for her character, saying: "I trust Hillary Clinton."
Kaine's prime-time speech on the third night of the Democratic National Convention marked the Virginia senator's biggest national debut as he formally accepted the Democratic Party's nomination for vice president.
"For my friend Hillary Clinton, I humbly accept my party's nomination to be vice president of the United States," he said. "Can I be honest with you about something? I never expected to be here."
In remarks highlighting his humble roots and years of public service, Kaine described to American voters how his life has prepared him for the job of vice president -- and president.
"I was born in Minnesota and grew up in Kansas City. My folks weren't much into politics. My dad ran a union ironworking shop ... and my mom was his best salesman," Kaine said. "My parents, Al and Kathy, here tonight and going strong, they taught me about hard work, and about kindness, and, most especially, faith."
To a packed arena, Kaine repeatedly drew a stark contrast between Clinton and the Republican nominee, Donald Trump, as he warned that the real estate mogul simply couldn't be trusted.
"Let's talk about trust. Let's talk about trust. I want to tell you why I trust Hillary Clinton," Kaine said. "On a personal level, as he's serving our nation abroad, I trust Hillary Clinton with our son's life."
Kaine's first appearance Saturday as Clinton's vice presidential pick received largely positive reviews -- perhaps because the expectations were so low.
He has earned -- and embraced -- an image of a low-key, less-than-dynamic stage presence, and his record as a public speaker has been somewhat uneven. But he'll have less breathing room when he takes center stage at the Democratic National Convention in Philadelphia.
Kaine may not get a full rousing reception in the Wells Fargo Center. He did not get a nominating speech Wednesday because of a fear of booing in the hall, a Democrat familiar with the situation said.
Bernie Sanders supporters could boo Virginia Rep. Bobby Scott, so Ohio Rep, Marcia Fudge, acting as the convention chair, simply mentioned his name as putting him into nomination.
Scott's remarks were rescheduled to around 9 p.m. ET, convention officials say.
The convention approved Kaine by voice vote and the music was immediately turned up as some delegates shouted "Roll call!"
'I am boring'
Kaine's record is one of a pragmatic, even cautious leader. He was well-liked, but known more for his electoral success than his legislative record. And his understated persona is a departure from the traditional attack-dog persona many presidential candidates seek.
Responding to those who have spoke less than kindly about his demeanor, he told "Meet the Press" in late June, "They're true. I am boring."
But Kaine's long-time friend and fellow senator Mark Warner said Tuesday that his fellow Virginian's tone and tenor make him the perfect antidote to GOP nominee Donald Trump -- something that Warner believes will be on display in his speech.
"I think you'll see somebody whose basic humanity and decency will come through," Warner said in an interview with CNN. "And in a world where we have too much politics of personal destruction, I think that will be a pretty refreshing sign for an awful lot of folks."
Kaine's record as a public speaker is somewhat uneven. His first major speech in front of a national audience was when he gave the Democratic rebuttal to George W. Bush's State of the Union in 2006. He drew a lukewarm assessment -- "The Daily Show" mocked Kaine's nervous habit of arching his eyebrow, something that Kaine's political team would later turn into a graphic on t-shirts and buttons.
But Kaine has had his moments. He was lauded for his heartfelt remarks at the memorial for the victims for the Virginia Tech tragedy. Kaine struck an emotional and powerful chord at a time when his entire state was in mourning. Shortly after the speech, his approval rating as governor was near 80%.
He wasn't able to keep up the sky-high number after that, however. His governorship was hit hard by the great recession, which led to massive budget shortfalls and standoffs with the Republican-led General Assembly. Term-limited in 2013, he left office with an approval rating under 50% and Republicans swept all three statewide offices in the race to replace him.
Despite his lagging poll numbers, Kaine remained in the public eye through his role as DNC chairman. When Sen. Jim Webb decided not to run for re-election, Kaine jumped into the race. Running arm-in arm with President Obama in 2012, Kaine was swept into office, outperforming the President in Virginia. During his time in the Senate, he has enjoyed healthy favorable ratings, part of the reason the Clinton decided to add him to the ticket.
He also has had his moments as a speaker. The day Barack Obama officially received the Electoral College votes that would earn him the presidency, Kaine gave a passionate speech about racial reconciliation in the Virginia State Capitol beneath a statue of Confederate Gen. Robert E. Lee.
"He wrote every word of that speech himself and was particularly proud of the way it was received," former personal aide Beau Cribbs said. "He puts a lot of effort into every speech, but when there is a lot on the line, he seems to take it to another level."
And he has found a way to be different. Early during his tenure in the Senate, Kaine became the first member to deliver a floor speech entirely in Spanish. The address was a pitch for comprehensive immigration reform and displayed a skill that turned out to be an important asset in the Clinton selection process.
However, nothing will compare to the stage that Kaine takes on Wednesday night. It will not be completely unfamiliar territory for the senator, as he spoke at the 2008 Democratic National Convention. But his spot then was not in prime-time and it was in a large football stadium, where much of the audience was not paying close attention. Now he will be speaking in prime-time and following heavy hitters like Obama himself.
It is a big moment for a muted politician. A moment that could set the stage for the next few months as he and Clinton begin their battle for the White House.
CNN's Jeff Zeleny contributed to this report.
By MJ Lee and Ryan Nobles