The people who buy this merchandise are defining themselves as the people David (the Psalmist) is talking about in verses 1-5, 20 of the same Psalm and therefore I guess that means Barack is David.
Prayer for Vindication and Vengeance To the leader. Of David. A
1Do not be silent, O God of my praise.
2For wicked and deceitful mouths are opened against me, speaking
against me with lying tongues.
3They beset me with words of hate, and attack me without cause.
4In return for my love they accuse me, even while I make prayer for
5So they reward me evil for good, and hatred for my love.
6They say,‘Appoint a wicked man against him; let an accuser stand on his right.
7When he is tried, let him be found guilty; let his prayer be counted
8May his days be few; may another seize his position
9May his children be orphans, and his wife a widow.
Later, he wishes all the evil they speak against him in verses 6-19 to be visited upon them in verse 20
20May that be the reward of my accusers from the Lord, of those who speak evil against my life.
It is sort of a biblical "I'm rubber you're glue" kinda thing.
Just more evidence these nutjobs can't or won't understand and/or read the Bible.