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From NBC's Mark Murray
The Clinton and Obama presidential campaigns today both are going up with dueling TV ads that talk about change. Clinton's ad, which is running in Iowa and New Hampshire, concludes with this line: "If we have the conviction, she has the experience. If we're ready for change, she's ready to lead."

Obama's, which is running statewide in Iowa, ends with Obama saying, "We are going to take back our government; we are going to make a change."

"Change" versus "experience," of course, has been one of the constant themes between the two Democratic front-runners -- with Clinton now touting that she possesses both attributes.