MAK PRAING, CAMBODIA — “I’m going to get my votes!” cried Mu Sochua as she stepped into a slender rowboat, holding one side for balance. “One by one.”

She was crossing a small river here in southern Cambodia on a recent stop in her never-ending campaign for re-election to Parliament, introducing herself to rural constituents who may never have seen her face.

The most prominent woman in Cambodia’s struggling political opposition, Mu Sochua, 55, is campaigning now, three years before the next election, because she is almost entirely excluded from government-controlled newspapers and television.

“Only 35 percent of voters know who won the last election,” she said.

She has no time to lose.

Ms. Mu Sochua is a member of a new generation of women who are working their way into the political systems of countries across Asia and elsewhere, from local councils to national assemblies and cabinet positions.