[Orgmode] Tags not lining up in org-indent-mode

[Jason Dunsmore]

I noticed that org-mode's tags do not line up along the right side when
org-indent-mode is enabled (indent-mode is an excellent feature, by the
way).  Probably because tab characters are being used to align the tags
on the right side.

Is there a way to use spaces instead of tabs to align tags, or is there
some other way to fix this?  I'm using Org-mode version 6.35trans
(release_6.35g.72.ge603).  Thanks.