“How did he do that?”
By withholding money. Bolduc in NH was outspent in the Republican primary 20/1. McConnell funded the other guy. Just like two years ago they did the same thing. They funded Corky Messner instead of Bolduc. Messner lost to Shaheen in the general election.
In the general election the Dems outspent Bolduc 40/1. It is hard to get your message out when you are constantly having to defend yourself against the lies being promoted by your opponent.
I will add the collusion of the NH Republicant Party by running upChuck Morse, withholding holding money, whisper campaigns at the State House... zero support for Bolduc.. he wasn’t their boy..
Along with the open primaries and doing very little with allow out of State college students to vote which impacts the results significantly in NH due to the population size.
The uniparty is alive and well in NH.