Watch even a few minutes and you're bound to see some synchronized sign-holding — brightly colored placards with slogans like "Stronger Together" waving in the crowd.
Bill Clinton had a formidable challenge on Tuesday: to sell the American people on one of the most disliked presidential nominees in political history.
A Clinton win would mean the president's policy legacy is kept intact, while a Trump victory would make the election all about a backlash to Obama's tenure.
The first lady drew a sharp contrast between the Republican and Democratic presidential tickets, speaking as a mother and what kind of country Americans want for their children.
Outside the convention, supporters of Bernie Sanders demonstrated against what they said was a rigged system, while the atmosphere turned chaotic inside the convention hall.
The first night, July 25, will feature Bernie Sanders and first lady Michelle Obama. President Obama and former President Bill Clinton will speak later in the week.
Before Hillary Clinton and Bernie Sanders took the stage, hecklers at the state's Democratic Party convention on Saturday interrupted the DNC head, who has been criticized for not adding more debates.