First Democratic Presidential Debate: By the Numbers

See which candidate was attacked the most during the debate in Las Vegas.

— -- Tonight's Democratic debate included five candidates -- one woman and four men. Six podiums were made up in case Vice President Joe Biden decided to turn up.

Hillary Clinton -- the party's front-runner -- was the candidate who was attacked directly the most, especially by Martin O'Malley. Clinton also went on the attack, going after Bernie Sanders a few times. The former secretary of state also talked the most during the debate, followed by Sanders.

Gun control, economic issues and climate change were some of the most mentioned issues from the candidates.

Here is a breakdown of the first Democratic primary presidential debate by the numbers: