"So what if it's risky? It's the right thing to do," said Richardson, one of the candidates in the crowded 2008 field. "What we're talking about is 160 people in deep pain. It only affects them."

The legislation would create a program under which some patients — with a doctor's recommendation — could use marijuana provided by the state health department. Lawmakers approved the bill Wednesday. The governor is expected to sign it in the next few weeks.

Richardson has supported the proposal since he first ran in 2002. But he pushed especially hard for it this year, leaning on some Democrats to change their votes after the bill initially failed.