Baseball Scoring - who is charged with the earned run?

A reliever comes in with runners on first and third and no outs. With infielders playing in, the batter hits a routine ground ball to the SS who boots it for an E-6. The runner on third scores, and now have runners on first and second. These two runners end up scoring on base hits with less than two outs. So here's the tricky part - three runs scored, two of them earned, and who is charged the second earned run, pitcher that started the inning or the reliever? This happened on Fri, 6/17/2011 in the Brewers/Red Sox game. The official scorer charged one run to the first pitcher and one run to the second, which to me, was the wrong way to score it. What do you think?