Scott Murphy, the Democratic candidate in the special election for New York’s 20th District, has received a television ad endorsement from Sen. Gillibrand, whose seat he is trying to fill. As Weigel reports, Gillibrand has become an overwhelmingly popular figure in the district since she was first elected in 2006, and Tedisco’s move to take over campaign advertising reminds Weigel of Norm Coleman’s last-minute repudiation of negative advertising:

This isn’t the kind of thing you do unless you’re desperate.

Meanwhile, the NRCC isn’t playing ball:

The NRCC has rebuffed their candidate, saying it won’t change anything about the way it’s approaching the race.

The special election is on March 31, and all of the momentum seems to be on Murphy’s side.