They are talking about politically experienced. Rice has never run for office before. When was the last time a VP candidate’s first run for office was as VP? Has that happened ever?
Sargent Shriver in '72 had never held elected office. He's the only one in recent memory, though both H.W. Bush and Cheney had been out of elected office for more than a decade when they became VP. There's also Stockdale and LeMay, if you want to count either of them as major VP candidates.
Yeah I edited it when I thought of him, Henry Wallace in 1940 too. But the point is it’s been a long time. Also 1972 was exceptional circumstances.