I could just as easily write:
"It's worth remembering that one disadvantage left-side politics have is that they are defending the status quo, and mounting such a defense is trench warfare, not a campaign that captures the hearts and minds of the next generation. By comparison, right-side politics are passionate for change. And it's when people are passionate that they get into disagreement. But because the right is so far away from achieving its goals, the passions inside the movement aren't as heated. Also, the right tends to be suspicious of political correctness and ideological litmus tests."
I suspect if you hung around Americans for Tax Reform, Heritage, Family Research Council, Eagle Forum, etc. for a while, you'd find that they want to overturn the status quo on taxes (perhaps a flat tax), government spending (reduce significantly), third-tier government agencies not mentioned in the Constitution (abolish), abortion (overturn Roe v. Wade), obscenity and indecency (remember the horror called the Communications Decency Act?), religion (erode church/state barrier), United Nations (get U.S. out, or reduce dues), federal regulations (dramatically roll back), Obamacare (repeal), Second Amendment (enforce RTKBA post-Heller), voter ID, marriage, home schooling (defend), public schools (vouchers), and so on.
Look at the 1968 Democratic Party platform. It talked about Head Start, Upward Bound, more federal spending on education, Medicare expansion, creating the Department of Housing and Urban Development, more regulation of industry, increasing Social Security spending, etc. [http://www.presidency.ucsb.edu/ws/?pid=29604]. It's been nearly half a century since then, and all those policies have been enshrined into law; the question today is not whether to eliminate them, but how much budgets will increase year-over-year.
Liberalism has won the culture war as well, as both conservatives and liberals have acknowledged for quite some time:
http://www.dailykos.com/story/2014/04/14/1291965/-Liberalism...
http://theweek.com/articles/469079/culture-war-over-conserva...