Nobody here has suggested that Meritocracy be diluted to the point where it's just a sound-bite [like Theresa May's idea of it] just in order to gain votes. However, working within a democracy means allowing people to vote, whether you think they're too stupid, or not.
My own opinion is that the majority are not stupid & to suggest so is simply an insult to most voter's intelligence. They may have made some crazy choices of late, but mostly these have been a protest vote against a system that has over-looked their wants & needs, or a wake-up call to the party they normally vote for.
Other forms of voting that seem irrational from the outside are to do with tactical voting, to prevent x,y or z from happening. There are some who do actually believe every word of the msm of course, there's no denying those type of voters do exist, but they're in the minority.
There's been various positive ideas to re-educate voters politically using voluntary methods put forward here. As with raising the bar on the 100% Inheritance Tax threshold to allow the electorate to get used to the idea, then lowering the threshold later when majority support is for it, a little tweaking in the introduction of radical ideas would not go amiss. That's all that's been suggested.
I would also suggest supporters of a political party would actually like to see that party gain office, as it's much easier to change the system once you're inside it. The rare case of UKIP bringing forth Brexit with one elected MP & 2/3 in the European Parliament is almost unique. It also seems that most previous UKIP voters will abandon them, now that they've reached their main goal. But we'll see how GE17 pans out ...
By all means don't compromise on fundamental beliefs, but neither be too rigid on the best way to reach those lofty goals. Or in short, don't make yourself completely un-electable from the outset.
If you insist on being the party who will make voters take an 'intelligence' test and/or take away the public's right to vote, all I can say is "good luck with that."