What do less successful canidates for a party’s nomination usually do before the national anthem?

The less successful candidates for a party’s nomination drop out of the race and support the front-runner before the national anthem.

Explanation:

The less successful candidates for a party's nomination mostly use to support their party's front runner during the National Convention.

In political parties, this is thought of as a common exercise to maintain public relations as the parties are expected to demonstrate a trait of unity towards the public.