Here's the thread and comment for context (the reddit markdown formatting
of crossed-out text is lost in the above plain text):
https://www.reddit.com/r/emacs/comments/4gcjep/cant_movebeginningofline_while_marking_region_in/d2hyxt6

On Thu, Apr 28, 2016 at 3:50 PM Mathieu Marques <mathieumarques78@gmail.com>
wrote:

> Remember to cover the basics, that is, what you expected to happen and
> what in fact did happen.  You don't know how to make a good report?  See
>
>      http://orgmode.org/manual/Feedback.html#Feedback
>
> Your bug report will be posted to the Org-mode mailing list.
> ------------------------------------------------------------------------
>
> In other modes, C-S-a and C-S-e behave as expected that is, move cursor
> to the beginning/end of line while marking region. In other words, it
> does what C-SPC C-a and C-SPC C-e would do.
>
> However in org-mode, C-a and C-e are bound to org-beginning-of-line and
> org-end-of-line respectively.
> In org-mode, C-S-e works as expected. But C-S-a does not.
>
> I have had these details over a discussion about my issue on /r/emacs:
>
>     The interactive arg for both org-beginning-of-line and
>     org-end-of-line is "P". So it carries over the raw arguments
>     received by the command. So ^ is not needed. The reason C-S-e still
>     works as expected is because of (call-interactively 'end-of-line) in
>     org-end-of-line, and so the raw args are passed to end-of-line
>     without any modification.
>
>     ~~Whereas we do not have (call-interactively 'beginning-of-line) in
>     org-beginning-of-line~~.
>     *Well, we do have (call-interactively 'move-beginning-of-line)*.
>     Instead we have goto-char calls to place the point before/after the
>     stars.
>
> Let me know if I can be of further help.
>
>
> Emacs  : GNU Emacs 24.5.1 (x86_64-apple-darwin15.2.0, Carbon Version 157
> AppKit 1404.34)
>  of 2015-12-28 on sandman.local
> Package: Org-mode version 8.2.10 (release_8.2.10 @
> /usr/local/Cellar/emacs-mac/emacs-24.5-z-mac-5.15/share/emacs/24.5/lisp/org/)
>
> current state:
> ==============
> (setq
>  org-tab-first-hook '(org-hide-block-toggle-maybe
> org-src-native-tab-command-maybe org-babel-hide-result-toggle-maybe
>                       org-babel-header-arg-expand)
>  org-speed-command-hook '(org-speed-command-default-hook
> org-babel-speed-command-hook)
>  org-occur-hook '(org-first-headline-recenter)
>  org-metaup-hook '(org-babel-load-in-session-maybe)
>  org-src-window-setup 'current-window
>  org-confirm-shell-link-function 'yes-or-no-p
>  org-startup-folded nil
>  org-support-shift-select 'always
>  org-after-todo-state-change-hook '(org-clock-out-if-current)
>  org-from-is-user-regexp "\\<Mathieu Marques\\>"
>  org-src-mode-hook '(org-src-babel-configure-edit-buffer
> org-src-mode-configure-edit-buffer)
>  org-agenda-before-write-hook '(org-agenda-add-entry-text)
>  org-babel-pre-tangle-hook '(save-buffer)
>  org-mode-hook '(er/add-org-mode-expansions whitespace-turn-on
> turn-on-auto-fill yas-minor-mode
>                  #[nil "\300\301\302\303\304$\207" [org-add-hook
> change-major-mode-hook org-show-block-all append local] 5]
>                  #[nil "\300\301\302\303\304$\207" [org-add-hook
> change-major-mode-hook org-babel-show-result-all append local] 5]
>                  org-babel-result-hide-spec org-babel-hide-all-hashes)
>  org-ctrl-c-ctrl-c-hook '(org-babel-hash-at-point
> org-babel-execute-safely-maybe)
>  org-cycle-hook '(org-cycle-hide-archived-subtrees org-cycle-hide-drawers
> org-cycle-hide-inline-tasks org-cycle-show-empty-lines
>                   org-optimize-window-after-visibility-change)
>  org-confirm-elisp-link-function 'yes-or-no-p
>  org-edit-src-content-indentation 0
>  org-metadown-hook '(org-babel-pop-to-session-maybe)
>  org-startup-truncated nil
>  org-clock-out-hook '(org-clock-remove-empty-clock-drawer)
>  org-src-fontify-natively t
>  )
>
> --

-- 
Kaushal Modi