Conservatives have more self-control

[Thumpalumpacus]

The fact that you cannot see it reflects upon you. I'd urge you to think about it a little.

Yeah, I figured you were going to resort to the junior high if you don't know I'm not going to tell routine.  

Your thinking is not my responsibility ... you're gonna have to do that for yourself.

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You wish.  Go ahead say some more funny things.  Rik can't provide for all the levity around here.

Seriously though, regarding the OP - does it surprise you?

I would prefer a study on locus of control by political view, but this is similar.

People with an internal locus of control believe that their own actions are the biggest determinant of outcomes in their life.

People with an external locus of control believe that outside forces are the biggest determinant of outcomes in their life.

Doesn't the first seem to go more with conservatives, and the second with liberals?

Perhaps stated this way, rather than in terms of more/less self-control, it's not controversial and makes sense to people.

It does, because it's shorn of the value-judgements that rightly or wrongly come along with judging someone disciplined or indisciplined.

I think it's also closely related to the idea of self-responsibility. I'm not sure that it breaks down so neatly by political outlook, though. I've seen enough conservatives rail against government handouts, and still shout "Keep the government out of my Medicaid!". Or, another example, corporations which donate to small-government Republicans while at the same time lobbying for subsidies. Or, take the Midwestern farmers who largely voted for Trump, but enjoy government price-supports.