+ [@twiplomacy's world leaders list is a start](https://twitter.com/twiplomacy/lists/world-leaders/members?lang=en) but more importantly, they have a number of curated lists.  

+ [Every Politician](http://everypolitician.org/) has social links for politicians.  

+ [Politwoops US](https://projects.propublica.org/politwoops/) 

+ [EU](https://politwoops.eu/countries) certainly have lists that could be used. 

+ [Switzerland](http://twitterpolitiker.ch/fraktionen.html) 

+ [List of current heads of state and government/twitter-list - Archiveteam](https://www.archiveteam.org/index.php?title=List_of_current_heads_of_state_and_government/twitter-list)  

+ [Parliament of New South Wales Twitter Links](https://www.parliament.nsw.gov.au/about/Pages/Twitter-Links.aspx)  

+ [Politwitter Lists (Canadian Gov)](http://politwitter.ca/page/twitter-lists)   

+ [US Senator Twitter Accounts, 115th Congress (Historical)](https://www.socialseer.com/resources/us-senator-twitter-accounts/)   

I can't find anything about open civic data, but I know they have curated lists for USA and Canada.