I'm running for president: Hillary Clinton
In an online video, where Clinton announced her presidency bid, she said: "I'm getting ready to do something too. I'm running for president."
She also took to Twitter to announce her decision as she posted: "I'm running for president. Everyday Americans need a champion, and I want to be that champion."
"I’m hitting the trail to earn your vote. Headed to Iowa," she said.
While on her road trip, Clinton tweeted: "Road trip! Loaded the van & set off for IA. Met a great family when we stopped this afternoon. Many more to come."
The video was shot last week, a campaign official told CNN.
Clinton's part was shot in New York with the rest of the video shot in places including Iowa and New Hampshire, a campaign official told CNN.
In 2008, she had lost to US President Barack Obama as she had ran for the Democratic presidential nomination.