The ACLU tries pretty hard to stick to their values, even when it puts them in opposition to Democrats. They've sued the Obama administration several times and have frequently defended groups (ex. Nazis) which liberals find repugnant.
For example, the ACLU supports the SCOTUS decision in Citizens United even though the majority of liberals and democrats strongly oppose it.
The ACLU has not defended the Nazi cause; the ACLU has defended the cause of free speech and peaceable assembly, even when those speaking and assembling peaceably are themselves Nazis.
For example, the ACLU supports the SCOTUS decision in Citizens United even though the majority of liberals and democrats strongly oppose it.