Bush imposed tariffs on European steel in March 2002, attempting to woo crucial rust belt states like Pennsylvania, West Virginia and Ohio. White House economists warned against the move, but White House political operatves overruled them.
Do you still believe Karl Rove is a genius?
The move upset US car makers and belied Bush's identity as a free-trader. It also, obviously, angered Europe, and the WTO just gave the EU the go-ahead to impose the biggest sanctions in the history of the WTO in retaliation, with products specifically selected to hurt industries in critical swing states. For example, Florida probably won't be too happy trying to sell orange juice after 100% tariffs. And having members of Congress and local leaders upset about it won't help Bush's campaign much, either.
Read about the mess here and here and here.