I differ on what he would be appalled by.
This from Media Matters:
In a "Talking Points Memo" devoted to "[h]ow Martin Luther King would view things today," FOX News host Bill O'Reilly declared that King "would be appalled by the secular culture" and by "the attacks on Christmas, the demonizing of Christianity." Media Matters for America has documented how in late 2004 O'Reilly used a recurring segment titled "Christmas Under Siege" to hype a series of bogus "anti-Christmas" stories, distorting and omitting key facts to declare that "progressive secularists" were "attacking" Christmas as part of a broader campaign to advance a radical agenda of "gay marriage, partial-birth abortion, euthanasia, legalized drugs, [and] income redistribution through taxation."
What I think King would be appalled by is the way Christianity is being used as a sword to draw and quarter anyone who doesn't agree with the right wing. He'd also be appalled with the way Bush is using African Americans to exemplify how Social Security is unfair, but saying that the thing to do is privatize and bankrupt SS faster rather than address the real problem: that our society is set up in such a way that African American males live shorter lives than their white counterparts.
He's also be appalled that Bush pulled out the "Help America Vote" act that forced electronic (rigged) voting down the throats of everyone on MLK's birthday a few years back, particularly ironic because it's often people of color and the poor who are often disenfranchised under the Bush system.
In fact, had King lived, I doubt very much we would have reached a point where Mr. Bush would have made it to office once, let alone twice.