Widgets/sidebar doesn't show on the single blog post pages

I’m using a child of twenty twelve.

Static front page.
The widgets show all right on main blog page but when you click thru to the individual post page, they do not show.

What is it that I need to modify so that that sidebar stays there?

The website in question is
http://www.iconoclasticpress.com/draft/

I want sidebars to show on pages like
http://www.iconoclasticpress.com/draft/blog/potlatch-world/

Hoping someone has an answer.