Paul Ryan would be a much better choice. He has a high probability of delivering the swing state of Wisconsin to Romney. He has budget credibility and solid support from the Republican base.
Rice brings nothing to the ticket. Blacks will vote for BHO regardless of whom Romney picks for VP. She did not impress me during her tenure in the Bush administration, and we don't need a pro-choice VP to dilute the pro-life credentials of Romney and the Republican party. If Romney picks her, my enthusiasm for the ticket will plummet dramatically.