Who introduce new ideas or press a particular issues but don't usually win elections?

Individuals or groups that introduce new ideas or advocate for specific issues but often do not win elections are typically third-party candidates or independent activists. They play a crucial role in shaping public discourse by bringing attention to alternative viewpoints and pressing social, environmental, or political issues that mainstream parties may overlook. Their influence can lead to significant changes in policy and public awareness, even if they do not achieve electoral success.