Mitt Romney is headed to Iowa to deliver what his campaign is billing as a major economic speech, a closing argument that makes clear the choice between him and President Obama. 

Excerpts released in advance suggest that the speech continues the theme his campaign debuted this week -- contrasting Obama's promise of change with real, big change.

"What this requires is change, change from the course of the last four years," Romney plans to say. "It requires that we put aside the small and the petty, and demand the scale of change we deserve: we need real change, big change. Our campaign is about that kind of change -- confronting the problems that politicians have avoided for over a decade, revitalizing our competitive economy, modernizing our education, restoring our founding principles." 

He describes the choice in the election: "This election is a choice between the status quo--going forward with the same policies of the last four years--or instead, choosing real change, change that offers promise, promise that the future will be better than the past."

In a July ad, "The Choice," Obama gave his own version of the "choice between two very different plans for our country," focused on the fight over tax cuts for the rich.