If you are going to make outlandish claims you'll have to provide legitimate sources. Reliable sources. Not "Chicagodsa.org" or articles written people but documented reports by reputable news organizations.
Chicago DSA is the website for the Chicago Democratic Socialists of America. That is a pretty reliable source when questioning who attended their events.
1. Obama is "radical"? How?
> Unprecedented expansion in executive power: assassination of American citizens, indefinite detention, and continuation of PATRIOT Act, etc.
> Completely unconstitutional foreign war in Libya. He didn't even seek Congressional approval before launching this war. So despite running as the peace candidate, he turned out even worse than Bush.
> Ignoring the rule of law with the takeover of the Auto industry.
> Support for massive Big Government to Big Business transfers (bailouts).
> Extreme rhetoric and outright lies against the Supreme Court regarding Citizens United and then in preparation for Obamacare case.
> Consistently attacking free market capitalism and the wealthy; stoking class warfare.
> Pushing debt-to-GDP beyond 100%, earning a credit-rating downgrade.
> Installing a government take over of the health care system.
> Creating new taxes and raising existing tax rates during a recession/weak recovery ($600bn tax hikes in Obamacare).
> Fighting for doubling the capital gains tax on top earners in the midst of a recession/weak recovery.
2. Obama has "links" to the DSA? So what?
Having attended conferences held by a socialist organization doesn't make one a "radical?" Then I think it's you who doesn't understand the term, not me.
3. Obama was an 'activist with acorn"?
I need:
1. Evidence that he was an "Activist" with ACORN
2. What "activist" means in this sense. What did he do that make shim radical with ACORN? Specifically.
ACORN is a political organization. Thus, people who work for ACORN are political activists. Obama worked for ACORN. Thus, Obama was a political activist. This is a well-documented fact.
And here's where the common sense comes in: have you ever known any moderate or centrist who, instead of pursuing a (potentially) highly lucrative career, instead decided to get down in the trenches and fight for a political organization such as ACORN? The fact of the matter is simply that moderates don't get involved in this kind of political activism. And that is something I can say from experience having worked with political activist organizations on the left (Clean Water Action) and the right (Campaign for Liberty and Republican Liberty Caucus).