Specific to USA

Sorted approximately on general usefulness:

• Propublica.org : Excellent deep dive investigative journalism giving vivid detail about issues with limited coverage elsewhere
• Ballotpedia.org : Helpful searchable source that pulls and consolidates candidate information
• Justia.com : Detailed newsletter with summaries on court outcomes
• join1440.com : Short helpful daily emails on a variety of topics

Specific to Washington

Again, sorted roughly in terms of usefulness:

• Washington Governor's Office Email Subscription : http://public.govdelivery.com/accounts/WAGOV/subscriber/new

Other

Some resources I have recently learned about, but am not yet sure of quality and usefulness: 

• https://councildataproject.org/ : Searchable transcripts of city council meetings
  
  
• guides.vote : Election guides from people experienced in the world of journalism