A decade ago, I became ordained in the Church of Latter-Day Dudes so I could officiate a wedding in Texas; it is, apparently, legal for the Dude to abide over the institution of marriage in that state.
But that was a different time, before an apathetic cosmic horror who craves nothing but worshipful death from his followers became an appealing alternative to the current leadership of several powerful nations. Which is why I've renounced by Dudeist vows, and am now ordained in the First United Church of Cthulhu.
In order to perform weddings, some states do require a letter of good standing from the local governing authority of your church; I learned this the hard way when I officiated a wedding in Massachusetts, and the governing authority for the Church of Latter-Day Dudes was characteristically lazy and unresponsive. Luckily, the website for the First United Church of Cthulhu offers clear instructions for this:
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You are the gibbering voice, the insanity-inducing dreaming mind blast, the writhing real world living tentacle of Cthulhu! As the head priest and exalted avatar of Cthulhu I ordain thee as a priest of Cthulhu. As such, you are granted by the power of Cthulhu to physically sign your own Letter of Good Standing. Or ordain a friend and have them sign it.
If you really need my signature as the Head Priest it's gonna run you $20. But that includes shipping and the cost of having it notarized. And I'm sorry your state sucks. You should really summon a few star-spawn and take care of that problem.