Kaine is a devout Catholic who spent his time as an attorney fighting for fair housing for people of color. He speaks Spanish fluently and was the first person to deliver a speech in Spanish on the Senate floor. He served on the Senate’s Foreign Relations and Armed Services committees where he became "a leading liberal voice on national security." (Source: http://foreignpolicy.com/2016/07/22/clinton-doubles-down-on-national-security-with-tim-kaine-pick/) He's best-known for waging a somewhat lonely campaign against the White House's use military force in Iraq and Syria without explicit congressional authorization.
He and Clinton have both wavered on the controversial Trans-Pacific Partnership trade deal, a frequent target of the Bernie Sanders-Elizabeth Warren wing. When the Senate voted to grant Obama fast-track authority for the deal last summer, Kaine signed on but said he would oppose the treaty if it didn't come paired with a worker retraining measure. (Some labor-friendly measures have been included, but Kaine is still not sure he'll vote for it: https://theintercept.com/2016/07/21/hours-before-hillary-clintons-vp-decision-likely-pick-tim-kaine-praises-the-tpp/ Additionally, some have argued he's weak on labor issues: https://www.thenation.com/article/tim-kaine-has-a-troubling-record-on-labor-issues/)
"Kaine bears a political resemblance to the candidate he [joins] on the Democratic ticket, sharing a political pragmatism focused on inching policy along and eschewing grand gestures," writes Patrick Caldwell at MotherJones. "To those who accuse him of insufficient progressivism, he might respond that he is, as Clinton has called herself, 'a progressive who gets things done.' (Source: http://www.motherjones.com/politics/2016/07/tim-kaine-vice-president-hillary-clinton-virginia-senate)
But despite a high rating from Planned Parenthood and NARAL, Kaine's history on support for abortion is a little sketchy, which disturbs the progressives in the party.
While running for governor of Virginia in 2005, Kaine promised that if elected he would "work in good faith to reduce abortions" by enforcing Virginia’s "restrictions on abortion and passing an enforceable ban on partial birth abortion that protects the life and health of the mother."
After taking office, Kaine supported some existing restrictions on abortion, such as Virginia’s parental consent law and a so-called informed consent law, which in 2008 he claimed gave "women information about a whole series of things, the health consequences, et cetera, and information about adoption." In truth, the information such laws mandate giving out is often "irrelevant or misleading," according to the the Guttmacher Institute.
In 2009 he also signed a measure that allowed the state to create "Choose Life" license plates and give a percentage of the proceeds to a crisis pregnancy network, though such organizations routinely lie to women to persuade them not to have an abortion.
However, also during his time as governor, Kaine slashed all funds for abstinence-only sex education.
He also spoke out during his run for the Senate in 2012 when then-governor, Republican Bob McDonnell signed a law requiring those who seek abortions to undergo an ultrasound prior to receiving care, calling the law "bad for Virginia’s women."
By the time he entered the Senate in 2013, Kaine seemed to have more fully aligned with progressive views on abortion, scoring perfect marks from Planned Parenthood. For instance, though troubled by the fraudulent anti-Planned Parenthood undercover videos that were promoted last year by the Center for Medical Progress, when Republicans scheduled a vote on defunding the organization, Kaine rejected the measure.
When the Supreme Court struck down Texas' anti-abortion laws, Kaine cheered the decision: "I applaud the Supreme Court for seeing the Texas law for what it is -- an attempt to effectively ban abortion and undermine a woman's right to make her own health care choices."
Kaine signed on as a co-sponsor of the Women’s Health Protection Act, which would prohibit states and the federal government from enacting restrictions on abortion that aren’t applied to comparable medical services. The measure would effectively stop targeted regulation of abortion provider (TRAP) laws, forced ultrasounds, waiting periods, or restrictions on medication abortion. TRAP laws have led to unprecedented barriers in access to abortion care.
Most recently, the senator has argued in favor of giving Planned Parenthood access to funding in order to fight the Zika virus. "The uniform focus for members of Congress should be, 'Let’s solve the problem,'" Kaine said. "Planned Parenthood is a primary health provider. This is really at the core of dealing with the population that has been most at risk of Zika."
His website says that he "support[s] the right of women to make their own health and reproductive decisions" and opposes efforts to overturn Roe v. Wade. He's personally opposed to abortion, but affirms that he believes that the government should not intrude.
"[These are] moral decisions for individuals to make for themselves. And the last thing we need is government intruding into those personal decisions," he said.
His running mate, Hillary Clinton, has spoken out against restrictions on abortion access and funding -- though she has stated that she still supports some restrictions, such as a ban on later abortions, as long as they have exceptions.
In general, this now seems to be a non-issue. But that may not be enough to sell progressives on this ticket. Clearly, the Clinton campaign has taken a chance on making itself look as grown-up and pragmatic as possible in comparison to Trump. It's obvious that this pick is meant to speak to Latinos, Republicans worried about Trump, and people of color. And it might. A guy who speaks Spanish and has fought redlining is better than a guy who thinks Latinos are rapists and who paints anti-police brutality protestors as being in cahoots with cop killers. The same business positions that alienate labor progressives could attract Republicans worried about the chaos Trump might unleash on the economy.
But is steady, establishment, and "boring," as some have characterized Kaine, going to stand up against larger-than-life, made-for-reality-TV-and-web trolling?
Boring has never been a big sell for Americans. It's doubtful that Millennials and progressives who have been mobilized by Sanders will be inspired by this pairing. See more concerning thoughts on this: http://gawker.com/dont-blow-this-1775111772