As for Syria being Iran's only route to the sea he probably should have said that Syria is Iran's only route to the sea than the US can't shut down in a moment's notice, because this was the point he was trying to make.
Feeling a little geographically challenged Finn?
Iran doesn't border Syria. There's a little country called Iraq which they would have to go through. Unless you are arguing that Romney was saying Obama screwed up the Iraqi war in which case I would like some evidence of Iran and Iraq colluding in some fashion but then I wanted some evidence of WMD before we went in there in the first place.