Issue with inserting user_id in ajax_insert_comment()

The array of data to be committed contained the key 'user_ID'. I believe it needs to be 'user_id' in order to be inserted into wp_comments correctly.

**Edit:** Linking to the codex on [wp_insert_comment](http://codex.wordpress.org/Function_Reference/wp_insert_comment) for reference. And some grammatical issues. And they capitalize id in comment_post_ID but not user_id...?