How weak is the New York State Republican party? Pretty weak, going by this post from Daniel at Urban Elephants:

New York has 29 Congressional Districts where 20 are held by Democrats and 9 by Republicans.

This year, the mid-term elections affect all 29 seats.

Of the nine seats held by Republicans, all nine of them are being challenged by Democrats.
Of the twenty seats held by Democrats, only FOUR are being challenged by Republicans

This, after the 2004 showing by Republican Howard Mills against incumbent Democratic Sen. Charles Schumer was the worst drubbing in New York since Burgoyne lost at Saratoga.