This morning, hundreds of students walked out of six Portland High Schools in solidarity with the Portland Association of Teachers' strike vote. The PAT reached an impasse in contract negotiations with the Portland Public Schools board on November 20, and the two sides have spent hundreds of hours in mediation since then over issues such as class sizes, salary increases and early retirement incentives. The 2900-member PAT will vote on whether to strike tonight at 7:00 pm at Arlene Schnitzer Concert Hall. Today's walkouts were organized by the Portland Student Union. KBOO's Jamie Partridge was on the scene at both Jefferson High School in North Portland and Cleveland High School in Southeast. Meanwhile, Mayor Charlie Hales has left the country, despite his campaign promise to stay active in Portland's education system.