Ceefax, page 125 3/4 says (emphasis added):
The Senate seat in Connecticut went to Joe Lieberman who stood as an independent on an anti-war platform after losing the Democratic primary.
Wrong. Ned Lamont won in the Democratic primary because Lieberman’s support for the Iraq war was unpopular with the committed Democratic voters who make up the constituency for a Democratic primary. However with voters as a whole, the pro-war Lieberman was much more popular which is why even running as an independent he was able to defeat the official Democratic Party candidate, Lamont.
UPDATE: Ah, I see the equivalent story on the website has half a clue:
The Senate seat in Connecticut has gone to Joe Lieberman, who stood as an independent after losing the Democratic primary to Ned Lamont amid strong anti-war feeling. He has said he will align himself with the Democrats.
“Amid strong anti-war feeling”: what a masterpiece of ambiguity. This does better than the Ceefax story in that it is not flat-out wrong. However a reader who did not already know the story would have to work very hard to deduce that Lamont was the anti-war one and Lieberman the pro-war one.
ANOTHER UPDATE: Ceefax now has a longer and more accurate explanation. However commenter “pounce” preserved an image of the original.