Dean Phillips vows to continue his campaign for the Democratic nomination to prevent a Trump victory in November. Photo: CHARLES KRUPA/ASSOCIATED PRESS Read ‘Potomac Watch’ column: https://www.wsj.com/news/author/kimberley-a-strassel Follow ‘Potomac Watch’ on Twitter: https://twitter.com/KimStrassel Subscribe to WSJ Opinion: https://bit.ly/3PovNsz More from WSJ Opinion: On site: https://www.wsj.com/news/opinion On Twitter: https://twitter.com/WSJopinion On Facebook: https://www.facebook.com/WSJOpinion #WSJOpinion #WSJ #PotomacWatch