Caucuses V Secret Ballot?

[Oerets]

For the life of me can not figure out why a Caucuses in Iowa carries so much interests. We vote in secret ballots for good reason. To keep from having others influence or bully our vote.

Something about having a room filled with loud excited voices seems intimidating. Less then a showing of the true feelings of the voters who do vote.

When was the last time Iowa picked the evidential GOP candidate BTW?