Being a libertarian will not disqualify you. There are specific questions about advocating for the violent overthrow of the US government, though. If you have d

Being a libertarian will not disqualify you. There are specific questions about advocating for the violent overthrow of the US government, though. If you have done that, or have been associated with or are known to be sympathetic to people that have done that, that's grounds for disqualification for sure. But the acts that you or they did or were planning to do have to be illegal; just expressing a general political view is not disqualifying, at least for civilian jobs. That said: getting a clearance is hugely expensive. It's not a thing you apply for. You apply for a job that requires one, and if you don't have one already, your employer gets you cleared on your behalf (if they're willing to foot the bill; if not, they only be looking to hire people who are already cleared). It's not something you can really do for fun, and in general you'd have to have accepted the kind of job that I would imagine someone with your views might not actually want.