Some attempt stories (though note the defendants are not only charged with attempt)

Silvia flagged in the comments to the attempt post below this interesting story from HuffPost: "North Dakota Man Pleads Guilty To Stealing Forklift To ‘Kill’ Donald Trump"

On a related front, another story from down south that may hit a little too close to home in a variety of ways: "Florida student arrested for threatening to kill professor over 7 am exam"

For the record, I am not in charge of setting the time for our exam. ;-)