(Portland, OR) -- Portland Public Schools and other districts across Oregon are closing entirely or partly today as teachers plan a walk out. Teachers unions are protesting over school funding. Oregon schools have some of the highest class sizes and lowest graduation rates in the country. The teachers say they're not calling for pay raises, but want to highlight the conditions inside the classrooms and how years of low funding from the government has impacted children's learning opportunities. Some schools will remain open as teachers opt for sit-ins or after-school rallies.