Running on Success

As a follow-up to my last post: Why exactly do we need to be a “Party of Ideas”?  Isn’t that a call for activism and major change?  Why can’t we run on the “We made everything good and want to keep it good” platform?  American life is better than it’s ever been, and we have liberals to thank for that.  Shouldn’t that be a good enough platform?  How about a “Don’t fuck with a good thing” platform?  Or is that just cheating?