Guest lineups for the Sunday TV news shows:

ABC's "This Week" - Republican presidential candidate Mitt Romney; Robert Gibbs, adviser to President Barack Obama's re-election campaign; Kevin Madden, adviser to Romney's presidential campaign.

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NBC's "Meet the Press" - Pre-empted by the Olympics.

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CBS' "Face the Nation" - Retired Supreme Court Justice Sandra Day O'Connor; Penn State President Rodney Erickson; Rep. Debbie Wasserman Schultz, D-Fla.

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CNN's "State of the Union" - Sens. Dick Durbin, D-Ill., and Kelly Ayotte, R-N.H.

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"Fox News Sunday" - Supreme Court Justice Antonin Scalia.