BELLEVILLE, Ont. - It's a familiar old photograph, but it can still move Justin Trudeau to tears.

The famous shot — Pierre Trudeau toting his young son like a football while an RCMP officer snaps a crisp salute at the prime minister — was too much for the Liberal leadership hopeful during a campaign stop Thursday in Belleville, Ont.

Trudeau the younger was presented the framed 1973 photo by none other than Belleville Const. Jeff Ling, whose father, a member of the prime minister's security detail, was the police officer in the picture.

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  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Pierre Trudeau is saluted by RCMP Officer as he carries son Justin to Rideau Hall in 1973. Justin Trudeau teared up when he was presented with a framed copy while visiting Loyalist College.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

  • Justin Trudeau visits Loyalist College in Belleville, ON., on Feb. 14, 2013.

The moment was captured on video by the campus news organization at Loyalist College in Belleville, Ont., shortly after the front-running leadership contender wrapped up remarks to journalism students.

Ling told Trudeau their fathers spent a lot of time together, including sitting in a hospital waiting room on Christmas Day 1971, the day Justin was born.

"Operation Newborn, I think we called it, when Dad was gone for Christmas," Ling said as Trudeau wiped away tears.

After accepting the gift, Trudeau moved in to give Ling a bear hug — but he got a crisp salute of his own instead.

After the pair shared a laugh and a warm embrace, Trudeau returned to the microphone.

"Almost every single stop across this country, I am overwhelmed with the people who come to me to tell me great stories about my father and great stories about my mother," he said, his cheeks still wet.

"I have so far been able to resist the tears that almost inevitably flow. Today, I failed in that."

Trudeau said he's "so touched and so honoured and so grateful" to the men and women who serve in the armed forces and police services that, in this case, he was literally reduced to tears.

"I apologize for that. I am not a crybaby but Valentine's Day and the kind of love I've been shown (by Ling) has just left me really emotional today."

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  • Surprising Justin Trudeau Facts

    With talk of Trudeau making a bid for the Liberal leadership reaching a fever pitch (again), HuffPost takes a look at some surprising facts about Canada's perpetual PM-in-waiting. (CP)

  • 11. Politics On Mother's Side Too

    Trudeau's maternal grandfather <a href="http://en.wikipedia.org/wiki/James_Sinclair_(politician)" target="_hplink">James Sinclair</a> was a Liberal MP and cabinet minister in Louis St.-Laurent's government in the 1950s. (House of Commons) <em><strong>CORRECTION</strong>: An earlier version of this slide incorrectly said Sinclair was a Progressive Conservative MP.</em>

  • 10. Born In Office

    <a href="http://en.wikipedia.org/wiki/Justin_Trudeau" target="_hplink">Trudeau was only the second child ever to be born while a parent was prime minister</a>. The first was John A. Macdonald's youngest daughter Margaret Mary Macdonald. Trudeau's younger brothers, Alexandre (Sacha) and Michel were the third and fourth. (CP)

  • 9. Educated Enough?

    Trudeau has a Bachelor of Arts degree from McGill and a Bachelor of Education from UBC. He also studied engineering at the Université de Montréal and environmental geography at McGill, but never finished degrees in those fields.

  • 8. Enemies To Friends

    While fathers Brian Mulroney and Pierre Trudeau were rivals, sons Justin and Ben are friends. Mulroney attended Trudeau's wedding to Sophie Grégoire. Grégoire has worked as Quebec correspondent for CTV's eTalk, which is hosted by Mulroney. (CP)

  • 7. Let Them Eat Anything But Cake

    Trudeau didn't have cake at his wedding, with <a href="http://www.macleans.ca/canada/national/article.jsp?content=20050606_106678_106678" target="_hplink">Sophie arguing that people never eat it anyway</a>. (Shutterstock)

  • 6. Born On Christmas

    <a href="http://en.wikipedia.org/wiki/Justin_Trudeau" target="_hplink">Trudeau entered the world on December 25, 1971</a>.

  • 5. Two Tattoos In One

    Trudeau has a large tattoo on his left shoulder. <a href="https://twitter.com/#!/justinpjtrudeau/statuses/179973685136998400" target="_hplink">The planet Earth inside a Haida raven</a>. Trudeau got the globe tattoo when he was 23 and the raven when he turned 40. (Media Ball)

  • 4. Keeping It In The Family

    Trudeau and his wife Sophie have two children, Xavier James (4) and Ella-Grace Margaret (3). Both are partially named after family.<a href="http://www.chatelaine.com/en/article/4970--the-littlest-trudeau" target="_hplink"> Xavier James is named after Trudeau's maternal grandfather James Sinclair</a> (the politician) and <a href="http://en.wikipedia.org/wiki/Sophie_Gr%C3%A9goire" target="_hplink">Ella-Grace Margaret is named after Trudeau's mother Margaret and Grace Elliot, Trudeau's paternal grandmother</a>. Xavier also happens to share a birthday with Pierre Elliott Trudeau. (CP)

  • 3. Politician And Actor

    <a href="http://www.imdb.com/title/tt0846011/" target="_hplink">Trudeau played Talbot Mercer Papineau</a> in the 2007 CBC miniseries "The Great War."

  • 2. .. And Video Game Star

    <a href="http://arts.nationalpost.com/2011/09/06/in-deus-ex-justin-trudeau-is-the-pm-and-canada-has-a-problem-with-illegal-immigrants-from-the-u-s/" target="_hplink">Trudeau is prime minister in the dystopian future portrayed in the video game Deus Ex: Human Revolution</a>. (CP)

  • 1. Childhood Sweathearts

    Sophie used to visit the Trudeau family home when she was a child. She was a classmate and friend of Trudeau's youngest brother Michel, who died tragically in a B.C. avalanche in 1998. Justin and Sophie made contact again at a fundraiser in 2003 and soon after began dating. <a href="http://www.macleans.ca/canada/national/article.jsp?content=20050606_106678_106678" target="_hplink">Trudeau was so smitten</a> that he declared they would spend the rest of their lives together on the very first date. (CP)