Democrats are facing what could prove a major difficulty in the general election: During the fall campaign, John McCain might have not one, but two sons serving in Iraq.

For the Democrats, that possibility could make it much more difficult to hit McCain on Iraq policy. And while McCain himself has avoided mentioning it in his speeches, at least for now, you can bet his surrogates will be more than happy to bring it up every time the Dems hit him on the war.