Odd smooth shading issue

Support Lighting and Rendering
1

When I try to apply smooth shading to my line of columns, it looks like this:

http://i.imgur.com/SoRYeRQ.png (I smooth shaded a few for an example)

Anyway to “connect” the shading on the columns? I tried connecting the objects themselves but it didn’t seem to do much.

2

Delete any faces that are inside the mesh (look at the mesh where you see errors)
Remove any double vertices (select all vertices and W / remove doubles)
Recalculate normals (select all vertices and Ctrl+N)