Below I summarize the primary races taking place this Tuesday by state; delegates up for grabs; whether the primary is open, mixed, or closed; latest RCP averages for the top three candidates; major newspaper endorsements; and major (cough cough) Republicans running against Trump in the Republican primary: Alabama; 52; open; no polls; Time-Daily (Bloomberg); Weld Arkansas; 31; open; no polls; no endorsements; Weld California; 416; mixed; Sanders-35, Warren-17, Biden-11; San Diego Union Tribune-Buttigeg, Mercury News (San Jose) and San Francisco Chronicle-Klobuchar, San Francisco Bay Guardian and The Times Standard (Eureka)- Sanders; Weld Colorado; 67; open; Sanders-31, Warren-18, Butt and Bloomberg-...