One of Haley's recurring arguments for her candidacy is that she's more likely to win the general election.

Her campaign has directly called Trump a loser, but Haley has not used the insult herself as far as I know. But as the campaign escalates, perhaps she will?

This is about Haley herself directly calling Trump the word "loser" as an insult. Stating that he lost the election doesn't count, or that she is more likely to win an election.

If someone submits proof of her doing so before this market was created, then the first option "She has already done this before market creation" will resolve yes.

All other options resolve yes if someone posts proof of Haley calling Trump a loser after the creation of this market and before the date listed in the option. Otherwise, each option resolves "no" as that date arrives.