I think people on the Left like Kevin Drum are over-analyzing what uncertainly and certainly really mean to the average GOPer.
It's 'uncertainly' when the agenda isn't GOPer and it's 'certainly' when the GOPers' get their way.
I thought people had figured that out by now. The irony of course is who in their right mind would look at any period of Republican ascendancy in the past 20 years and wax nostalgic over the level of 'certainty' flourishing back then.