Recent primary elections have brought surprises for progressive candidates in competitive states. The outcomes have been closer than expected, with voters providing narrow margins.

This has led to a key lesson for those following politics: the landscape is unpredictable. Factors contributing to the surprises include a lack of high-quality polling in certain states.

Further details on these primary elections and their implications are available from KVIA ABC-7 and analysis by Zachary B. Wolf, CNN.