I like the summary by a commenter:

Shorter version:

Dear Madame Speaker,

Believe and say what we tell you to believe and say or else.

Sincerly,

Money

Those who’re wondering if this will get ugly have missed the fact that it’s already pretty damn ugly when top donors of one candidate are threatening to shaft the party if they don’t nominate their candidate (which is basically the subtext here….)

(link)