PHOENIX (AP) -- When Turning Point USA's annual AmericaFest convention reached its halfway point, Erika Kirk tried to put a smiling face on things. "Say what you want about AmFest, but it's definitely not boring," said Kirk, who has led the influential conservative organization since her husband Charlie was assassinated in September. "Feels like a Thanksgiving dinner where your family's hashing out the family business." That's one way to put it. Some of the biggest names in conservative media took turns torching each other on the main stage, spending more time targeting right-wing rivals than their left-wing opponents. The feuds could ultimately define the boundaries of the Republican Party and determine the future of President Donald Trump's fractious coalition, which appears primed for more schisms in the months and years ahead. Here are some of the most notable moments from the four-day conference.