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The "Rocky" was in business before The Denver Post and for more than 140 years provided an effective counterbalance to the Post's reporting and editorials in Colorado. They won Pulitzer Prizes for their reporting and photography.
Some of the former management at the Rocky are trying to resurrect some of their paper online by supporting it via the paid content model, but if that didn't work for the New York Times, it probably won't work for the Rocky either.
In any case, the Rocky was never "second string" by any stroke of the imagination.