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of course this is one of the most important battles there is going. the semantics battle. by controlling the language you control the playing field and the war is waged on your terms, literally. see george orwell.
i like progressive because of the connotations. im 31 and so i think that those older than me use liberal because what the word represents to them and their era. but progressive has been co-opted by the centrist wing of the democratic party as cover for their agenda, and this is the war of words that i speak of. i don't like to be associated with centrist democrats, who i despise more than hard right republicans because those on the hard right let you know plainly where they stand, while centrist democrats use words like "progressive" as cover for their pro business, pro war, pro imperialist aspirations.
basically if you want to know what im all about i use other words: "green party, noam chomsky, bernie sanders, chris hedges" and so on. thats a quick summation of what im all about.
"green party" sums it up nicely. or actually my favorite word of all for inciting rage almost universally: Ralph Nader. i would usually use those words in a sentence like: I love Ralph Nader, and all that he stands for.