A new poll shows New York Rep. Michael Arcuri (D) leading businessman Richard Hanna (R), but the party isn't taking that lead for granted.

The Democratic Congressional Campaign Committee on Tuesday released a TV ad hitting Hanna for, among other things, his position on Social Security.

Arcuri led Hanna 48 percent to 40 percent in a Siena Research Institute poll released Monday. However, the poll of 605 likely voters — the first independent survey of the race — had a margin of error of plus-or-minus 4 percent. Arcuri defeated Hanna by only 4 percent in 2008.