Emotionally Powerful, But Undefined Terms
Some of the most emotionally powerful words are undefined, such as "social justice," "a living wage," "price gouging" or a "fragile" environment, for example. Such terms are especially valuable to politicians during an election year, for these terms can attract the votes of people who mean very different-- and even mutually contradictory-- things when they use these words.
I'd add a few more terms like anything with the word "fair" in it, e.g. "fair trade," "fairly traded," "fair wage," "fair trade coffee," etc.
Update: In the comments, Fred adds "Level playing field," another good one.