Simply excellent paragraph from Free Exchange:
I have trouble with any ideological reading of the economics, because the two (ideology and economics) so rarely fit well together. I don't want to elect a free-market supporter or an interventionist. I want to elect someone who will carefully consider the issues and determine that here the government ought to assign pollution property rights, while here the government should reduce licensure, and so on. I want, in short, someone with enough intellectual heft to know the difference between good policy and good politics.
This promotes the idea a kind of cipher-wonk as a political leader, which is an interesting idea - do we want ideology-free politicians? - but I think extrapolating the point to economics in general is worthwhile. Ideology and economics really don't get on, and perhaps a lot of the misuse and misunderstanding of "economics" in political stumping and election coverage is indeed due to that tension, that ideology infests politics more than it can get into economics.
The very concept of positivist economics is precisely what the Free Exchange quotation is invoking when arguing that we should be electing someone who can do a proper analysis - an objective analysis - instead of someone whose prejudices and ideology biases them consistently in one direction or the other, regardless of the evidence.
Laudable? Probably. The sticking point, again, is that pesky word ought, as in "I want to elect someone who will carefully consider the issues and determine that here the government ought to assign pollution property rights, while here the government should reduce licensure, and so on." Then we're back to square one: we can elect our wonk, who does an objective analysis before enacting any policy, but at some point we need to figure out which option to take, and all the objective analysis in the world can't prescribe; again, there's no such thing as technocratic economics. Surely that makes it impossible to avoid ideology in politics? Surely, also, that's why sterilizing economics can't also sterilize economic policy. We can do that economic analysis, but we always have to answer the normative question of what we want if we are to make use of it.