As to why it is so popular with those involved in Toevah marriage, IMHO, I think it has something to with how colorful and “cheery” it is.
Actually it has to do with the fact that Judy Garland has become a gay icon (even though she, herself was never gay nor strongly expressed any sentiment with the gay rights movement.
When asked about how she felt about being a gay icon, she responded, “I couldn’t care less. I sing to people.” — Wikipedia.
The Wolf