The so-called "religious" right is praying for an end to Barack Obama's time in office -- one way or another. If you see one of these items, the wearer or owner does not wish the president well.
Diana Butler Bass at Beliefnet explains that Psalm 109 is one of the “imprecatory” prayers, “a lament in the form of petition to destroy one’s enemies.” While perhaps intended to be a joke, she notes that the psalm actually “entreats God to destroy the president”:
It is the personal prayer of an individual, someone who has been dealt an injustice by another–and usually more powerful–person. The words of Psalm 109 are those of deep agony, the longings of a victim for retribution and justice. This psalm is considered one of the most difficult of all the psalms–full of violent images of vengeance and death.