"Now the fun part starts," she declared. "We're into the last month, and we're going to start drawing a contrast, because I want every Iowan to have accurate information when they make their decisions."

Later, Obama issued a statement decrying Clinton for saying the coming weeks would be "fun."

"Washington insiders might think throwing mud is fun, but the American people are looking for leadership that can unite this country around a common purpose, and that's what I'll continue to offer in this campaign," Obama said.

¶ 7:41 PM