Yet that reflexive impulse can itself generate distrust when such responses eventually come to light, as they often do - as when, for example, Hillary was shown to be less than forthright over her emails. Clinton maintains these leads, though at slightly smaller margins, when third-party candidates Gary Johnson and Jill Stein are included. Internally, the Clinton campaign must be in a near-panic.
The appearance comes as Clinton moves into the final stages of picking her vice president, with an announcement expected as soon as next week.
Kaine appeared relaxed on turf he knew well. Perched somewhat awkwardly on stools and speaking without notes, Clinton and Kaine addressed union workers, senior citizens, college students and campaign volunteers inside a college gym.
"You want a trash-talker president or do you want a bridge-builder?" "I want to be an outsider".
What happened? Apparently the FBI's recent report on Clinton's email heightened what already were public concerns about her honesty and trustworthiness.
In Florida, Clinton also paces Trump, 44% to 37%. Pence also endorsed Sen.
Some Democratic senators on Wednesday rallied around Mr Kaine. Kaine gently guided the candidate to some stairs and a rope line so they could shake hands with enthusiastic supporters.
"Hillary's ready for Virginia".
"She'll get the best done that she can", Kafka said, adding that both Trump and Clinton were too aggressive on foreign policy for his taste. "You're ready to fight". Kaine, a former missionary in Honduras who speaks Spanish, peppered his introduction with Spanish phrases and criticism of Republican Donald Trump's statements regarding Latinos. A graduate of Harvard Law School and a devout Catholic, he married the daughter of a former Virginia governor and began his career representing clients who were racially discriminated against in rental housing.
The former civil rights lawyer is a Virginian, which could help Clinton win a battleground state in the November 8 race against Trump. Not known as an attack dog on the stump, or a darling of the progressive wing of the Democratic Party, Kaine made sure to cover those bases Thursday. He's been critical of Trump's proposed temporary ban on foreign Muslims entering the US, calling the idea "offensive and unconstitutional".
Earlier in the day, Clinton told the League of United Latin American Citizens that immigration reform hinges on her victory. But Comey said Clinton was "extremely careless" in her handling of classified material. I was in the cabinet when she was accused of fraudulent dealings in Whitewater, and then accused of wrongdoing in the serial rumor mills of "Travelgate" and "Troopergate", followed by withering criticism of her role as chair of Bill Clinton's healthcare task force.
"I really don't love either of the candidates".
The new poll, by contrast, shows Clinton's support plunging by 16 percentage points, down to 45 percent, while Trump's support has only dropped two points to 23 percent.
The joint appearance was meant to catapult the party toward a successful and unified Republican National Convention, which kicks off in Cleveland on Monday.
FBI Director James Comey said last week that Clinton and her staff were "extremely careless", but that investigators found no proof she or her aides meant to break laws governing the handling of classified information.