Incumbent Tom Carper won Thursday's Democratic U.S. Senate primary in Delaware, easily fending off a challenge from a political newcomer who had hoped to become the latest liberal candidate to score an upset against a powerful legislator.
Carper's victory set up a November race against Rob Arlett, President Donald Trump's former campaign chair in this heavily Democratic state. Arlett defeated former PayPal executive Gene Truono in the Republican primary.
"This is not the finish line," Carper told a crowd of about 60 supporters, including Democratic Gov. John Carney, in declaring victory. "This was a good solid win."
Carper, 71, won by nearly 30...