Still, in many cases, the candidates left a trail of questionable assertions.

That is a questionable assertion since Pollock, who died in 1956 at 44, didn't have the chance to see his work in big museums.

In some cases the authors serve up questionable assertions with little or no effort to back them up.

That is a highly questionable assertion, unproven and possibly wrong, but it needs to be addressed in greater detail.

National independence, he warned, is often "a questionable assertion in a global economy where cooperation pays greater benefits in every area than destructive competition."

Yet in the continuing dispute over the graduation rate, Mr. Ferrer has made some questionable assertions of his own.

That was a questionable assertion, and, in fact, it roused Mr. Brokaw.

You even make a very questionable assertion.

This report contains some very questionable assertions about both scientific and legal matters.

A lot of very questionable assertions with no evidence there.