No, I think those other ones land you in some pretty darn-hot water too. I've never seen an able bodied public figure make fun of disabled people and get away with it. Racism has a certain historical context too, and things like that are always extra touchy. Remember after 9/11 when terrorism was the buzz word and terrorist was one of the worst things you could call someone?
An able bodied politician recently gaffed and told a wheelchair bound senator to stand up because he's a nice guy... Senator McClellan, however, has been disabled due to his service to the country in the Vietnam War. That politician, who has been known to never say anything right in his 32 year career, is now known as the Vice-President Elect.
As far as racism having a historical context? It's all in the media and how you decide to focus on it. I don't see quite the same outrage or outrage at anywhere close to that level when it comes to Asians.
The fact that the Chinese were specifically targeted as having no rights in the west where they were shot at, blown up, and worked to death, without being recognized as contributing to the railroads. Then you have the Chinese Exclusion Act passed by Congress with the intent to restrict Chinese immigration and keep their families overseas so the Chinese can never have roots in this country. The Act also specifically restricted the Chinese to resident alien status and stripped many of citizenship. It finally got repealed in 1943. That's pretty recent.
Then you got the internment and confiscation of Japanese-Americans and their belongings in WW2 because of their race.
How about the Chinese Holocaust at the hands of the Imperial Japanese? 6 million Jews died at the hands of Nazi Germany. 20 million Chinese died under Imperial Japan... and that's a conservative number. Haven't heard too much about it.
Okay... finally, what about how everyone can say "cracker, redneck, whiteboy, etc." and it's cool? Because some white people were bad a few generations ago so every white person now has to pay for it? I didn't do it. My ancestors certainly didn't do it, I looked it up.
If we're going to talk about racism, let's talk about it equally.
Oh... Chicago and the Daley machine suck. They have always sucked. The Alderman and patronage system suck. Corruption is part and parcel of their political landscape.