Tell me when Brown failed to get 51 votes. Tell me where that "agreement", which specifically ended the necessity of a 60-vote supermajority for her nomination, said, "This agreement regarding the non-filibustering of Janice Rogers Brown doesn't apply if she is nominated to the Supreme Court."
The Pubbies tried unsuccessfully to get cloture so they could have a vote on JRB. Only when the Gang of Fourteen struck their deal was she able to get a vote and get confirmed.