Maybe because the progressives hate the idea of a Convention of States that places limitations on their power.
Plus you know...that fact you like to point out about how many state houses and governorships the GOP has.
Right now at this point in time there is no way Liberals would be able to to a damn thing at a Constitutional Convention. We don't need the blue states to even attend to make any of this happen.
For once they'd have to truly sit down STFU and accept the results.
While I agree with the theory, we have seen the results of relying on Republicans to limit power, government, and spending, and frankly, the results do not proclaim the reliability we wish to see.
The idea that those in State Governments with their eye on the brass ring of Federal Politics limiting the power of the very positions to which they aspire tells me that rowboat will be towing a sea anchor.
That isn't to say that can't be overcome by titillating the comparative envy and greed of those who know they will go no higher up the governmental food chain and want the power back at home to wield for the good of the State, the Country, (and fun and profit which seem to creep in somewhere with amazing consistency)--oh! and the good of their constituents--those voter people, of course.
If the right play is made by those who truly want to limit Federal Power and return those powers to the States, and the right angle exposed for those who are just there for the prestige, power and money, it may indeed be possible to form coalitions, state by state, to prevail, even within the GOP.
I just don't have a plugged nickel's worth of faith in the untainted patriotism of the GOP at this point, a lack of faith they have fully earned in this State and elsewhere.
That isn't saying there are not good people there, but there remains a significant contingent who, regardless of party, will vote with the prevailing wind.
The forces allied against this, seeking to corrupt the process, to render it a waste of time are many and well funded, and will be laying down the astroturf like stadium groundskeepers, relentlessly, and with their other hand in a position to control media and the presentation of what the public will be told to believe.
It will take a well organized and coordinated social media sh*tstorm to overcome the lies, and expect to be met with the same, conducted by professionals who not only understand the medium, but who are masters of the game when it comes to politics.
All this just to pick delegates.
Beyond that, if this should get that far, expect the onslaught against a favored recent primary candidate to look like amateur hour compared to the attacks on delegates, measures, proposed amendments and the outright lies about the nature, desired effects, and effects of the Amendments under discussion, especially with respect to the aggrieved classes who have plenty of time to create serious security problems and may even be motivated enough to physically or violently attack the people and venues.
I'm not saying don't do it. I'm not saying give in because it will be hard, I am just saying if you do, go in with both feet on the ground, and gird your loins, because it is going to be a nasty fight.
The state legislators like having the pork to split among their districts and buy votes with, too, and the Federal contingent provides that. Make it more direct, and the whole current two-party food chain loses stroke from bottom to top, because the State legislatures will have to directly tax the people of their state to get the stuff to give away instead of just hand out money from Congress. Why, that might mean challengers would take their jobs.