For a platform independent, multi-line, text-based calculator check out the Extensible Expression Evaluator.

It's clear that in designing OpalCalc you were motivated by many of the same considerations that went into my design of the Extensible Expression Evaluator. However, I realized that most of the important features could be gotten just by leveraging JavaScript's math library, with the result that it has a similar feature-set but is platform and (nearly) browser independent, there is nothing to download, and it is easy for users to adapt to their own purposes.

This would have worked in the Extensible Expression Evaluator. http://bsidneysmith.com/E3/extensible_expression_evaluator.aspx

Had I known about this, I'd probably never have written my own. (Extensible Expression Evaluator, http://bsidneysmith.com/E3/extensible_expression_evaluator.aspx) Mine is less gee-whiz in some respects, but it is very accessible and intuitive, and I provide documentation to make it easy for a user to extend or customize its capabilities. It is also trivial to embed in one's own webpage, and is freely downloadable under the GNU GPL.

This is a very good point. Our adherence to a two-party system is not so much a feature of our political establishment as of our political culture. One might say it is an antidemocratic (small d) trait in American culture that exists for historical reasons and needs very much to be overcome. In a functioning democracy people would search for candidates with whom they largely agree on the issues they consider paramount, and vote for that candidate. If they could not find such a candidate, they would organize with other like-minded people to recruit one. In the U.S. most voters have internalized the obvious fallacy that voting for someone who is unlikely to win is a waste of their vote, when the opposite is more generally true. If even a comparatively small proportion of voters began voting "for" rather than voting "against" our political culture would be revitalized, probably transformed.

This school board member's (lack of) quantitative skills and his attitude towards them are now endemic in the U.S., and are emblematic of the decline of our culture and of our institutions. As a faculty member in a large public university I helped put in place a program to require students to pass a test of 8th-grade math (mostly arithmetic) before passing the university's gen-ed math class (the easiest offered). This test was modeled on state requirements for that grade level, and contained nothing students were not ostensibly required to know before receiving a high school diploma. They were given any amount of free tutoring they wanted, and could take the test as many times as they needed to pass. The reaction to this requirement from the students, their parents, and even some faculty was so ferocious that it had to be abandoned, which means the university continues to award bachelor's degrees to people who can't calculate a percentage, or who even know what that means. This situation indicates that the U.S. will not recover as a functioning democratic republic, because the ignorant cannot govern themselves.