Who is Tim Kaine?

ABC's Liz Kreutz gives insight on why Tim Kaine was chosen to run with Hillary Clinton.
1:42 | 07/28/16

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Transcript for Who is Tim Kaine?
And Virginia senator Tim Kaine he formally accepted the nomination for vice president and as you saw. He wasted no time taking aim at truck that's right king used his first major speech on the national stage it goal after Donald Trump not mincing. Many words as he attacked the Republican he also course defended. Hillary Clinton ABC this crisis was inside. And take a look at why Cain was picked for the ticket she's in Philadelphia list. Good morning banning can this last night we saw Hillary Clinton's newly minted running mate Tim Kaine out there acting attack dog mocking. Donald's front meanwhile defending Clinton has trust for any and consistent. His speech was also an introduction. Of sorts we know that he's not the most well known senator but that Clinton actually says that's what she likes about him she said that behind that big wave he has a spine. A steal enough Clinton didn't content make this decision about Cain overnight we're told that she looked at least 23 other contenders for this spot including Elizabeth Warren. Leading Castro and Cory Booker. Ultimately though aides say Clinton decided that she wanted somebody with national security experience somebody that she thought could do the job. On day wine and she believes that that is Tim Kaine. Of course you can't deny that Cain has. Some other attributes that are attracted to the Clinton camp when he speaks Spanish something that is on full display here last night his son is a marine. He's from Virginia a critical swing stay in this election and he's also a moderate. Democrat Alan some on the left of this party are sad about that they Wear out your pro testing him the Clinton camp sees as an opportunity. To. Perhaps attract independent voters moderate Republicans. White male voters voting blocs that they believe could really swing this election tightening Candace.

This transcript has been automatically generated and may not be 100% accurate.

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