The result was a powerful challenge to the very foundation of campaign finance reform in both politics and constitutional law.

And it remains a powerful challenge for artists today.

Two species trying to communicate with each other-it was a strange but powerful and alluring challenge.

The ranks of the computationalists have probably never had such a powerful challenge as this book.

As for the politicians, they have proved quite adaptable in the face of powerful challenges.

The Bell inequalities are the most powerful challenge to Einstein's claims.

Ragnar Rommetveit has provided a powerful challenge to this positivist tendency (1982).

And the challenge to the poorer regions posed, in the field of the single currency, an extremely powerful challenge.

This is a powerful challenge now facing the society.

And he justified India's nuclear tests "as a powerful challenge to the practitioners of nuclear apartheid."