A gentleman named Pat Lang has suggested that the Iraning Government may be supplying the Insurgents with mines and other items to kill U.S. troops.
If this is true the Cheney idea of bombing Iran with Nukes seems to make sense. It is a threat to Iran to stop bringing Iraq into it's sphere of influence. The only way to stop Iranian influence in Iraq may be to bomb Iran.
http://turcopolier.typepad.com/sic_semper_tyrannis/
Here another poster from Booman say the same thing in much greater detail.
http://www.boomantribune.com/?op=displaystory;sid=2005/8/6/175738/5568