NRO’s the Corner quotes a poll this morning taken in 19 battleground states:

Nearly 6 in 10 likely voters claim that they that they recently saw, read or heard something about the TV ad ìSwift Boat Veterans for Truthî released and began airing in several key battleground states questioning the truthfulness of Senator Kerryís Vietnam War record. Among those who claimed to have seen, read or heard something about the ad, a majority overall and among undecided voters said it would not impact their vote either way. However to the extent it did impact voting intentions, it was a negative for Sen. Kerry by as much as nearly a 3 to 1 margin.