Hillary Clinton Kicks Off Presidential Bid on Social Media

The Democratic hopeful launched her campaign with a YouTube video.
2:50 | 04/13/15

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Transcript for Hillary Clinton Kicks Off Presidential Bid on Social Media
I'm Tom llamas. We begin with Hillary Clinton's official announcement. After months of dodging the question, finally saying she's running for president for a second time. But she didn't do it in person. Instead, the campaign kicked off with this video, sent out on social media. Twitter lighting up. Check this out with the 'announcement. Retweeted 3 million times the first hour. Trending number one across the globe. ABC's Cecilia Vega who will lead our coverage of the campaign starting us off tonight from Brooklyn. Reporter: Good evening. This building is Hillary Clinton headquarters. The street behind that, Clinton street, appropriately named. For two years, questions about Hillary Clinton's political future. Will she run? Won't she run? Tonight, we know the answer. A presidential campaign launched on youtube. Hillary Clinton making her long anticipated entry into the 2016 race officially official with this. My daughter is about to start kindergarten next year. And so we're moving. Reporter: A video that doesn't even show her face until halfway in. I'm running for president. Reporter: The former first lady, senator, and secretary of state once again hoping to be the first woman in the oval office, making her pitch through voices like these. Moms. Workers. Black, white, spanish-speaking, and gay. I'm getting married this summer to someone I really care about. Reporter: It will be the theme of her campaign for the next 576 days. She says the focus is not on her, but on people she called everyday Americans. Everyday Americans need a champion. And I want to be that champion. Reporter: And while her supporters are cheering, Chelsea tweeting, "Very proud of you mom." So many others ready to pounce. From "Snl" -- Hillary would make a great president. And I would make an even greater first dude. Reporter: -- To republicans. Opponent Rand Paul releasing this ad today. Hillary Clinton represents the worst of the Washington machine. Reporter: Clinton may be the presumed democratic front-runner, but according to a new poll, 72% of democrats and independents say it would be a good thing if she faced a serious challenger. Don't you some day want to see a woman president of the United States of America? Reporter: First stop on the campaign trail, Iowa, where Clinton will meet with small groups of voters. The one person who won't be there? Her husband. And Cecilia joins us lye. Speaking of her husband, what kind of role will former president bill Clinton play in the campaign? Reporter: We won't see him for the first few weeks of travel. A top Hillary Clinton aide tells us he has been involved in virtually every major strategy session. He's her most important adviser. We'll see him on the campaign trail eventually. You can bet on that. We know you'll be traveling with her all the way. Thank you so much.

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

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