The cancellations, just four days after her stunning win in the Delaware GOP primary, comes on the heels of O'Donnell's positive reception at the Values Voters Summit on Friday.
Campaign spokeswoman Diane Banister told the AP Saturday that O'Donnell canceled so she could attend previously scheduled events -- including a picnic hosted by Delaware's Sussex County GOP. The picnic doesn't get underway until 2 p.m. according to the GOP Sussex County Republican Committee's website.
Another Tea Party favorite, Senate nominee Rand Paul (R-KY) canceled a planned interview on NBC's "Meet the Press" in May, citing exhaustion. That was just the third cancellation from a major guest in 62 years, the show's Executive Producer Betsy Fischer said in an interview at the time.
CBS host Bob Schieffer tweeted that Republican Strategist Ed Rollins and Michael Gerson of The Washington Post would be filling in for O'Donnell.
"I feel your pain, Bob. A page from Rand playbook!" Fischer tweeted Saturday.
The "Fox News Sunday" website was still promoting O'Donnell's appearance as of Saturday afternoon. Karl Rove -- who had been critical of O'Donnell's "nutty" views but later backed the candidate -- was also scheduled to be on the program.