When we say constituents, what do we mean by that? People who voted for that candidate? Or 50% of the region's total population?
The latter.
I'll think about it. 50 percent would be as low as I could go. My only concern left with 50% is a candidate from one party could win by small margin in a region where they weren't the favorite, only to have the majority party vote them out 30 days later after being able to get the numbers. If I had my way, I'd make it 2/3s like everything else to override something.