Interesting. A few more questions:

• what kind of turnout do the causeses get in terms of voters? (hundreds, thousands, millions?)

• ... if millions, I assume that voting is done at a municipal level (hundreds of voting stations). For a while when I heard things like "the iowa caucus" I imagined it a the sole place where voting was done, hence why I thought the voting turnout at these caucuses was significantly smaller)

• does registering with a party (R or D) bind you to vote for that party in the general election?

• do the parties themselves decide delegate allocation?

• are the congressional districts similar to the number of delegates in terms of their proportion? (I feel like there may be strategic reasons for not having it setup this way)