Earlier Thursday, RNC leaders rejected a proposal that would have changed rules for convention in July. The controversial proposal would have called for the convention to shift from the U.S. House rules the party's gatherings have traditionally used to Robert's Rules of Order. Such a change might have made it harder for party insiders to draft a so-called "white knight" if there is a contested convention.

RNC Chairman Reince Priebus was opposed to the change and had repeatedly said that rules governing the convention should be made by delegates assembled in Cleveland, including those at committee meetings held the week before the convention.

So the rules will be made in Cleveland, not Florida, and by 112 delegates on the Rules Committee (2 from each state and territory), not a group of RNC leaders attending a conference. Here is the GOP's website section "Convention HQ."

At the beginning of Convention, the 2016 Convention Rules Committee puts its recommended rules package before all delegates. The Rules Report cannot pass without the approval of a majority of all delegates. Approved rules go into effect immediately and last until the 2020 Republican National Convention.

The rules passed in 2012 were only intended to last until the beginning of the 2016 convention. Here are the rules passed in 2012.

As of today, the RNC official count is:

• Trump: 846
• Cruz: 544
• Kasich: 149

According to the RNC, there are 674 Delegates remaining, and a total of 2,472 delegates at the convention.

The whole "white knight" discussion seems like wishful thinking. Trump doesn't really need 1237 pledged delegates before Cleveland because some states are sending unpledged delegates to the convention. For example, PA is sending 54. If Trump wins them over before Cleveland, they could put him over the top. If he's close to the 1237 number when the primaries end:

In particular, Trump would likely turn to Pennsylvania, which has 54 unbound delegates. If Trump can convince enough of those delegates to put him over the threshold before the convention, then he wins on the first vote—even without having secured 1,237 bound delegates through the primary process. Trump, who is likely to win decisively in the state, could argue with some plausibility that those delegates should go his way. As Steve Kornacki noted on MSNBC last night, most of those delegates are already saying they will side with the candidate who wins their state.

But Pennsylvania isn’t the only place with delegates that could be courted to put Trump over the finish line. Outside of Pennsylvania, there are more than 100 additional unbound delegates up for grabs in places like North Dakota and Wyoming—but also American Samoa and Guam.

It is possible to imagine, then, that negotiations with delegates from these places held after the end of primary voting could end up ultimately deciding the nominee.

So, what would the doormouse have told Ted Cruz and anti-Trump Republicans? I'll stick with "Feed your head." It's not going to happen. The November election will be between Trump and Hillary.

Republicans dropped the ball with Trump and have only themselves to blame. And if a Trump nomination (and loss in November) kills off the Republican party, or even the just the most conservative wing of the Republican party -- all the better.

(Aside: Grace Slick's voice is really powerful in this video, which is from Woodstock, 1969. It really builds as the song goes on, just a great performance.)