How to display poll in single post?

try runphp plugin.

use [poll=ID] where ID is the ID of the poll. It is stated in the readme under Usage Tab

The instructions under the Usage tab don’t mention runphp, so presumably you don’t need it using that linking method.

Also, “That didn’t work” isn’t very descriptive. It can save everyone a lot of time if you tell us what you did and what you actually observed happening.

Usually, that’s not enough…(switching between Code and Visual)
http://wordpress.org/support/topic/133998?replies=5#post-615308

What is the exact thing that you pasted/typed?

you DO NOT NEED that, just type [poll=1] where 1 is the ID. it is in the readme.html under Usage Tab. Read carefully.