The underlying market is in dollars, and will remain that way.
Is the currency likely to switch to euros (or another currency) in the (often predicted) case of sudden drop in value of the dollar? A vote for PES is a vote for EPP! A vote for EPP is a vote for PES! Support the coalition, vote EPP-PES in 2009!
That happened last year: part of the rise in oil prices was due to a drop in the value of the dollar.