The backstory behind the pin Tim Kaine was wearing at the vice presidential debate

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Viewers tuning into Tuesday's vice presidential debate appeared to have a question on their mind: What pin was Virginia Sen. Tim Kaine wearing?

According to Google, searches for "Kaine pin" spiked as the debate started.

So what pin was he wearing? The Democratic vice presidential nominee had on a Blue Star Pin, which is worn by family members to represent deployed military personnel.

Click through images from the vice presidential debate:

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Vice presidential debate
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) and Republican U.S. vice presidential nominee Governor Mike Pence shake hands as they arrive for their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) shakes hands with Republican U.S. vice presidential nominee Governor Mike Pence at the start of their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Debate moderator Elaine Quijano arrives on the debate stage at the start of the debate between Democratic U.S. vice presidential nominee Senator Tim Kaine and Republican U.S. vice presidential nominee Governor Mike Pence at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Debate moderator Elaine Quijano (L) looks on as Democratic U.S. vice presidential nominee Senator Tim Kaine shakes hands with Republican U.S. vice presidential nominee Governor Mike Pence (R) at the start of their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Debate moderator Elaine Quijano (R) looks on as Democratic U.S. vice presidential nominee Senator Tim Kaine (L) shakes hands with Republican U.S. vice presidential nominee Governor Mike Pence at the start of their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Rick Wilking
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) and Republican U.S. vice presidential nominee Governor Mike Pence discuss an issue during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Jonathan Ernst
Republican U.S. vice presidential nominee Governor Mike Pence (L) listens as Democratic U.S. vice presidential nominee Senator Tim Kaine speaks and moderator Elaine Quijano (C) looks on during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Joe Raedle/Pool
Democratic U.S. vice presidential nominee Senator Tim Kaine discusses an issue with Republican U.S. vice presidential nominee Governor Mike Pence (off camera) during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Republican vice-presidential nominee Gov. Mike Pence answers a question during the vice-presidential debate at Longwood University in Farmville, Va., Tuesday, Oct. 4, 2016. (AP Photo/David Goldman)
Rev. Jesse Jackson listens during the debate between Democratic U.S. vice presidential nominee Senator Tim Kaine and Republican U.S. vice presidential nominee Governor Mike Pence at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Rick Wilking
Democratic U.S. vice presidential nominee Senator Tim Kaine speaks during his debate against Republican U.S. vice presidential nominee Governor Mike Pence (not shown) at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Democratic U.S. vice presidential nominee Senator Tim Kaine debate Republican U.S. vice presidential nominee Governor Mike Pence (R) during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Andrew Gombert/Pool
The audience watch the U.S. vice presidential debate between Democratic U.S. vice presidential nominee Senator Tim Kaine and Republican U.S. vice presidential nominee Governor Mike Pence at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
Democratic U.S. vice presidential nominee Senator Tim Kaine speaks as Republican U.S. vice presidential nominee Governor Mike Pence (C) and debate moderator Elaine Quijano (R) look on during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Jonathan Ernst
Democratic vice-presidential nominee Sen. Tim Kaine answers a question during the vice-presidential debate at Longwood University in Farmville, Va., Tuesday, Oct. 4, 2016. (AP Photo/David Goldman)
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) and Republican U.S. vice presidential nominee Governor Mike Pence discuss an issue during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Jonathan Ernst
Republican U.S. vice presidential nominee Governor Mike Pence (L) speaks as Democratic U.S. vice presidential nominee Senator Tim Kaine and debate as moderator Elaine Quijano (C) look on during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Joe Raedle/Pool
Democratic U.S. vice presidential nominee Senator Tim Kaine (C) speaks during his debate aginst Republican U.S. vice presidential nominee Governor Mike Pence moderated by Elaine Quijano (L) at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Andrew Gombert/Pool
Democratic vice-presidential nominee Sen. Tim Kaine speaks with Moderator Elaine Quijano of CBS News as Republican vice-presidential nominee Gov. Mike Pence, not seen listens during the vice-presidential debate at Longwood University in Farmville, Va., Tuesday, Oct. 4, 2016. (AP Photo/Steve Helber)
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) listens as Republican U.S. vice presidential nominee Governor Mike Pence speaks during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Andrew Gombert/Pool
Democratic candidate for Vice President Tim Kaine gestures during the vice presidential debate at Longwood University in Farmville, Virginia on October 4, 2016. / AFP / Jewel SAMAD (Photo credit should read JEWEL SAMAD/AFP/Getty Images)
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) and Republican U.S. vice presidential nominee Governor Mike Pence discuss an issue during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Andrew Gombert/Pool
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) shakes hands with Republican U.S. vice presidential nominee Governor Mike Pence at the start of their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Chris Keane TPX IMAGES OF THE DAY
Democratic U.S. vice presidential nominee Senator Tim Kaine speaks during his debate against Republican U.S. vice presidential nominee Governor Mike Pence, moderated by Elaine Quijano at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Chris Keane
Republican U.S. vice presidential nominee Governor Mike Pence speaks as Democratic U.S. vice presidential nominee Senator Tim Kaine and moderator Elaine Quijano (C) look on during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Joe Raedle/Pool
Democratic U.S. vice presidential nominee Senator Tim Kaine discusses an issue with Republican U.S. vice presidential nominee Governor Mike Pence (off camera) during their vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Rick Wilking
Democratic U.S. vice presidential nominee Senator Tim Kaine (L) and Republican U.S. vice presidential nominee Governor Mike Pence (C) debate during their vice presidential debate moderated by Elaine Quijano (R) at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Jonathan Ernst
Republican vice-presidential nominee Gov. Mike Pence and Democratic vice-presidential nominee Sen. Tim Kaine, right, shake hands after the vice-presidential debate at Longwood University in Farmville, Va., Tuesday, Oct. 4, 2016. (Joe Raedle/Pool via AP)
Republican vice-presidential nominee Gov. Mike Pence and Democratic vice-presidential nominee Sen. Tim Kaine stand after the vice-presidential debate at Longwood University in Farmville, Va., Tuesday, Oct. 4, 2016. (Joe Raedle/Pool via AP)
Republican U.S. vice presidential nominee Governor Mike Pence greets his wife Karen Pence after the conclusion of the debate with Democratic U.S. vice presidential nominee Senator Tim Kaine at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Joe Raedle/Pool
Democratic U.S. vice presidential nominee Tim Kaine (C) and his wife Anne Holton (R) greet a guest in the audience at the conclusion of the debate with Republican U.S. vice presidential nominee Governor Mike Pence at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Rick Wilking
Anne Holton (R), the wife of Democratic candidate for Vice President Tim Kaine greets her husband after the vice presidential debate at Longwood University in Farmville, Virginia on October 4, 2016. / AFP / SAUL LOEB (Photo credit should read SAUL LOEB/AFP/Getty Images)
Anne Holton (L), wife of Democratic U.S. vice presidential nominee Tim Kaine shakes hands with Karen Pence (R), wife of Republican U.S. vice presidential nominee Mike Pence at the start of the vice presidential debate at Longwood University in Farmville, Virginia, U.S., October 4, 2016. REUTERS/Kevin Lamarque
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Kaine's son is an active-duty member of the Marine Corps, something he noted in his opening remarks at Tuesday night's debate against Indiana Gov. Mike Pence.

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