Dave Trembley is incapable of handling a bullpen.
Top of the 7th, 4-3 lead, top of the lineup due up for the Twins:
Now is the perfect time to bring in George Sherrill. You've stated that he's lost the closer's job, and it's a late inning situation with key lefties coming up for the Twins. Why not ask Sherrill to go five batters, bring in Ray for the next part of the lineup and then have Johnson (who shows no major platoon split) close it out? Or Baez, who has been pitching well? I give up hope for Dave Trembley as an Orioles manager.
Update: Hey, look! George Sherrill can shut down the lefties! I stand by my earlier statements: you bring Sherrill in for the 7th and it may not have been necessary to score in the bottom of the 8th to take the lead.