Coming Up on 'This Week': Obama Senior Adviser David Plouffe

NEW YORK, AUGUST 31, 2012— -- White House senior adviser David Plouffe, President Obama's top political adviser and the architect of his 2008 election victory, speaks with George Stephanopoulos on the 2012 presidential contest, Sunday on "This Week."

Former Massachusetts Governor Mitt Romney officially becomes the Republican presidential nominee, as the GOP wraps up its national convention in Tampa. As Democrats prepare to take the stage in Charlotte, N.C. for their convention next week, can President Obama convince voters that he deserves a second term? Or did Mitt Romney and Paul Ryan make the case for turning the page to a new team this fall?

White House senior adviser David Plouffe weighs in on the latest in the 2012 presidential election, Sunday on "This Week."

Then, the powerhouse roundtable debates the Republican and Democratic conventions, with ABC News' George Will; Priorities USA co-founder Bill Burton; Romney campaign senior adviser and former Massachusetts Lt. Governor Kerry Healey; Democratic strategist and ABC News contributor Donna Brazile; and political strategist and ABC News political analyst Matthew Dowd.

Did Romney win over any undecided voters disappointed in President Obama's first term and the state of the economy? Was Romney able to show his personal side and make voters more comfortable with him as the potential president? Did any of this week's convention speakers, from Chris Christie to Clint Eastwood, undermine Romney's efforts? And what do President Obama and Democrats have to do at their convention to make an effective case for re-election?

Plus, "This Week" takes its weekly trip through history in "What Year Was It?" See the whole political picture, Sunday on "This Week."