1.   But among producers like Romo, success brought a debate as thorny as the cactus-like plant from which the drink is made.

2.   In the matter of three hours, a thorny debate had disappeared.

3.   In Wisconsin, the thorny debate cost one lawmaker, state Sen. George Petak, his job.

4.   It marked the first tentative steps by the Swiss to take a stand in thorny political debates without hiding behind the shield of its vaunted neutrality.

5.   The issue delves into the thorny debate of stem cells, which are taken from embryos and can grow into various kinds of tissue.