I disagree -- the fault is both with the media dominance and liberal hive mind mentality.
But the Left is losing on the Global Warming angle, even with the two aces in their pocket you mentioned. I think the two (I forgot about one before) issues of our time that are cementing the Left's power from here on out in this country, that they couldn't achieve it on with other issues, is the gay issue and the drugs issue.
Because the Left is tolerant of particularly those two, the level of viciousness of their intolerance of countless other things is overlooked, and the lack of an economic recovery (and no change in that in sight) is lowered in importance.
Gays and drugs are how this new era of America was ushered in. We don't care about nothin' else in the U.S.; the millions of our fellow citizens who have been long-term unemployed or grossly underemployed, world-destabilizing beligerent Iran getting a nuclear weapon, whatevs. For the younger generation, sure they might say they care, and actually care a little, about income inequality, the environment, racism, blah blah blah, but what's really locked them in is the strong contrast in Left/Right stances on gays and drugs.
Especially from now on, no Republican who could win the primary can win the general election.