This is an answer which shows that using 2 spaces doesn't format as code:

This is a line with two spaces before it.

This is a line with four spaces before it.

This is an answer which shows that using 2 spaces doesn't format as code:

This is a line with two spaces before it.

This is a line with four spaces before it.

And I couldn't resist adding a line with two spaces before it, 
  cheating with a `` tag ;-)