the main article was about all the unfair and false criticisms Obama has received from the mainstream media, including him being muslim/terrrorist/anti-american, etc.
From BBC article:
The magazine says the cartoon is intended as a satirical comment about some of the distorted right-wing attacks on the Democratic senator.
[...]
"The burning flag, the nationalist-radical and Islamic outfits, the fist-bump, the portrait on the wall? All of them echo one attack or another. Satire is part of what we do, and it is meant to bring things out into the open, to hold up a mirror to prejudice, the hateful, and the absurd. And that's the spirit of this cover," the statement said.
The portrayal of the Obamas "fist-bumping" one another was a reference to a campaign rally in St Paul, Minnesota, back in June, at which the couple were seen to "fist-bump", an action described by one Fox News commentator as a "terrorist fist-jab".
http://news.bbc.co.uk/2/hi/americas/7505953.stm