What factors should I consider when granting an electorate?

I'm playing as Austria, Emperor of the HRE, and one of the electors was recently fully annex by a neighbouring state. I can now choose to replace them, and grant another state in the HRE the status of elector (allowing them to choose the next emperor).
What factors should I consider in my decision to choose a new elector. Obviously a nation that has good relations with me now is more likely to vote for me in the short term, but are there any long-term effects I should watch out for (nations with the potential for expansion, weak nations, strong nations, nations that border me, etc.)? Or, are there good reasons for not choosing a new elector at all?
Best Answer
Another consideration is beating an OPM out of someone and giving it an electorate - the +100 relations from releasing it in peace deal lasts quite a while and will insure you have its vote for a long time.
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Answer 2
I would first secure an alliance, marriage(if applicable) and vassalage if possible. This allows you to "rig" the elections in your favor. As long as you know that nation will vote for you i don't think you need to worry about those sort of things with a few exceptions. Choosing smaller nations closer to you is my personal preference acting as a "big brother" sort of figure. Nations that border can cause the relationship effect "Border Conflict/Border Tension" which can negatively affect a nation. But if the nation hold none HRE lands and expands for more none HRE land i wouldn't chose said nation because it is a high possibility of it "blobbing" which places them as a HRE ruler contender. @me if you need clarification.
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