$arah Palin, of course.
As others quicker off the mark than I these days pointed out, Palin and her sycophants produced this map, as well as reams of political eliminationist discourse directed at ideological opponents. 
Palin has a history of evading responsibility for her actions, as well as shirking her obligations. Over and over, she's blamed others for everything that shines a spotlight upon her intellectual laziness, her egotism, the fabrication of her image and her greediness. Couric allegedly ambushed her; though she (and family members) preened in clothing and luxury items bought by the Republican party during the presidential campaign she refused to wear the issue; she abandoned her job as Governor of Alaska to pursue lucrative proposals yet said it was the media's fault she quit, etc. etc. etc.
Some political observers think Palin's bid for the presidency will be damaged by the Tucson carnage, others believe she'll bounce back.
Andrew Sullivan:
"There is no way to understand the politics of this without Palin. She has long been the leader of the movement that drapes itself in military garb, that marinates in violent rhetoric, that worships gun culture, that has particular ferocity in the state of Arizona, and that never ever apologises for anything." He adds: "My hope is that this horrifying momentary conflation of politics, guns and mental illness will lead responsible figures on the right to eschew the path of Palin."
David Frum:
[...] Palin's response – condolences to the victims and a simple denial of any responsibility – was perfectly fair in reply to opponents who suggested the crosshairs contributed to the shooting. But if she wanted to be a leader, she had to go beyond that, he said. He called on her to express real grief and sincere compassion, be visible, engage in the debate, and challenge opponents [...] "Palin is splashed by that history [the build-up to the Tucson incident] and the challenge is to find something big and generous to speak of in a larger way. So far, she has opted not to do so."
Expect the usual whining from Palin and her die-hard supporters. It will be difficult for Palin to spin that she is - not Gabrielle Giffords and the citizens killed or injured by the shooting - the "real" victim of this tragedy. Nonetheless she'll exploit her own brand of truthiness in her favour.
And also, go read Dr Dawg, Audrey II, Buckdog and Simon.
Update: Palin responds, not as Frum suggested, but in her habitual 'Pit Bull with Lipstick' attack form. Republican Jewish leaders choose to remain silent on Palin's opportunistic appropriation of the term "blood libel".
Grand merci to Jymm.
