US President Barack Obama has released an online video and emailed supporters to announce he is seeking a second term in office.
Mr Obama's web campaign was seen as a key part of his election success in 2008, the BBC reports.
The re-election announcement was widely expected, and his campaign team is expected to file papers for next year's election later this week.
Analysts say Mr Obama will have to work to convince US citizens he has delivered the type of change he promised.
Mr Obama does not appear in the video, posted on YouTube as well as the official campaign website. Instead supporters look back to the 2008 campaign and talk of their hopes for the 2012 bid.