John Casey grew up in South West Missouri and graduated high school early before joining the Marine Corps. He was deployed to the Middle East and later led more Marines. After returning from service, he worked in construction in Missouri and became concerned about illegal immigration and foreign influence in politics. Casey has spent significant time managing institutional risk in high-finance before transitioning to the public sector.

John Casey's political identity is marked by a staunch anti-establishment rhetoric, advocating for the elimination of property taxes and foreign aid while opposing foreign lobbyist money. His policy stances reveal an intriguing mix of hardline immigration control and economic protectionism, such as his call for a moratorium on AI job replacement. Casey's legislative proposals, including repealing the Hart-Celler Act, suggest a highly localized approach to immigration policy. His advocacy for repealing the NFA and Hughes Amendment, alongside calls for disbanding the ATF, showcases a radical stance on gun rights. Furthermore, his support for releasing the Epstein files indicates a commitment to accountability and transparency in government.