First of all, he compared Romney to a popular and easily remembered toy. That toy can and will be used for devastating visuals. The analogy also highlights one of the biggest problems Romney has. People accuse him of being shaky on his principles, and what could illustrate that better than an EAS. Draw out a statement by him on it and then make it disappear.
Romney will not to be able to outrun this moniker. He has now been permanently branded by his own side. Seamus was gaining a lot of traction, but that's gone. He probably would like that one back. Santorum's campaign workers were giving out miniature EASs at Romney headquarters.
Are they really trying to get him elected? He needs to fire everybody around him and go it alone.