Today's Siena Poll (.pdf) shows strong movement towards Democrat Scott Murphy, who is running for Kirsten Gillibrand's former seat in NY-20.

With less than three weeks until the special election in the 20th C.D., Democrat Scott Murphy has cut Republican Assembly Minority Leader James Tedisco’s 12-point lead by two-thirds. Tedisco now leads the race 45-41 percent, having led two weeks ago by a 46-34 percent margin, according to a new Siena (College) Research Institute poll of likely voters. While two weeks ago, voters said Tedisco would do a better job than Murphy representing them on six issues, Murphy now leads on two of those issues, including the most important issue for 20th C.D. voters: the economy.

“Scott Murphy has significantly narrowed the gap against Jim Tedisco, trailing by only four points in a district that has a 15-point Republican enrollment edge,” said Steven Greenberg, spokesman for the Siena New York Poll. “Only 13 percent of voters remain undecided – down from 20 percent – and nearly 90 percent of voters say they are absolutely or fairly certain they will not change their minds.

Given the district's strong republican lean and Tedisco's institutional name recognition, that's a spectacular achievement.