How Can I Learn to Tango?

The easiest way, with the least committment, is to go to a milonga or practica (see definition below). Most milongas and practicas currently running in Portland (click on "milongas" on the main menu bar to see list) have a free beginning lesson as the first hour of the event. There are always complete beginners at these lessons, so even if you've never danced a step of tango, you need not feel intimidated. There will almost surely be other, equally inexperienced dancers there, and the lessons are always designed to accommodate absolute beginners.
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... or ... There are over two dozen experienced Argentine Tango dancers in Portland who also teach. See "Teachers" on the main menu bar for a list and description. All of them offer private lessons for you as an individual (whether man or woman), or for you and a partner. Private lessons are more expensive than the free lesson at a milonga, of course, but you get undivided attention from the teacher.
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... or ... Most Portland teachers also offer groups classes throughout the year. If you click on "Calendars" on the main menu bar, you can see what is scheduled. You should also sign up for Portango-a, so you can receive email announcements when new classes are formed.