Blog page formatting

Is there a way to make the height of each summary post the same?

I want to avoid large gaps between posts. See example – http://nutspokerclothing.com/blog/

1. In the second row the left hand post is slightly shorter than the right post
2. In the third row the left hand post is slightly longer than the right post
3. In the fourth row there is no left hand post (??!!) and the post on the right is very long
4. In the fifth row the left hand post is shorter than the right post

and so on. So how can I ensure that all posts have the same height?