You can watch advertisements for both the Democratic and Republican parties on television, campaign websites and, of course, on YouTube.
Presidential nominees and primary candidates have used video to campaign for decades. Though many ads predate the term "viral video," those memorable moments from past elections live on, gaining millions of views on YouTube.
Whether through smear campaigns, sympathy grabs or catchy jingles, we've seen candidates do just about everything to grab our attention and get their messages across.