Remember that National Security Republicans vs. Rand Paul article from last week? The shoes are beginning to drop:

Dick Cheney today announced that he is endorsing Kentucky Secretary of State Trey Grayson over Rand Paul in the GOP Senate primary.

"I'm a lifelong conservative, and I can tell the real thing when I see it. I have looked at the records of both candidates in the race, and it is clear to me that Trey Grayson is right on the issues that matter — both on fiscal responsibility and on national security," Cheney said in a statement released this morning.

Cheney's endorsement centered on national security, which was also the topic of Grayson's recent advertisement against Paul.

"The challenges posed by radical Islam and Al Qaeda are real and will be an on-going threat to our domestic security for years to come. We need Senators who truly understand this and who will work to strengthen our commitment to a strong national defense and to whom this is not just a political game," Cheney said.