Here's part of Obama's radio interview that mentions Republican President Ronald Reagan:

"I don't want to present myself as some sort of singular figure. I think part of what's different are the times...I think Ronald Reagan changed the trajectory of America in a way that Richard Nixon did not and in a way that Bill Clinton did not. He put us on a fundamentally different path because the country was ready for it. I think they felt like with all the excesses of the 1960s and 1970s and government had grown and grown but there wasn't much sense of accountability in terms of how it was operating. I think people, he just tapped into what people were already feeling, which was we want clarity we want optimism, we want a return to that sense of dynamism and entrepreneurship that had been missing. "


http://blog.washingtonpost.com/the-trail/2008/01/17/obamas_reagan_comparison_spark_1.html?nav=rss_email/components

A video segment of that interview is included with that newspaper article.

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Here's a quote from Ronald Reagan's son in response to what Obama said:

"If I understand what he was saying I can't entirely disagree with it. They both came along at times when society was on the cusp of change and they are both agents of change," Ron Reagan Jr, told the Huffington Post, a liberal political site. "As far as Barack Obama being a similar agent of change, that remains to be seen. But what I do see him saying is that we are in a historical moment right now like the 60s and 80s. And I think he's right. We are overdue for a cultural shift right now."
-snip-

Of course, Bill Clinton [on behalf of his wife Hillary] and John Edwards are playing politics with Obama's words.

For instance, check out how Bill Clinton misinterpreted what Barack Obama said:

"Her principal opponent said that since 1992, the Republicans have had all the good ideas."

http://firstread.msnbc.msn.com/archive/2008/01/18/589163.aspx
"Bill Also Hits Obama On GOP Ideas"


-snip-

Here's what Markos Moulitas, founder of dailykos wrote:

"Huh. I didn't see the part where Obama said the GOP's ideas were "all the good" ones.

In fact, Obama isn't saying anything that couldn't come straight out of [kos's book] Crashing the Gate -- that the GOP build a Vast Right Wing Conspiracy that used its think tanks to create ideas, a media machine to sell those ideas, and a modernized campaign operation to win elections on those ideas. Yes, the GOP was the party of ideas. They were crappy ideas. But they were "ideas"."