The Mike McMahon campaign is slated to roll out an endorsement from Ed Koch tomorrow afternoon on the steps of City Hall.

The endorsement should not come as too much of a surprise, since Koch endorsed McMahon when he ran two years ago, but still, Koch is one of the few endorsers, political professional say, who can actually move voters, especially older voters, of which there are a lot in McMahon’s district. And Koch is willing to endorse Republicans–recall that the Dan Donovan campaign trotted out Koch the day after Eric Schneiderman won the Democratic primary.

Although McMahon’s district leans Republican, and went for McCain in 2008, most political observers are now giving it to McMahon, albeit with some hesitation. On a scale from Solid–Likely–Lean–Tossup, the Cook Political Report rates the race a “Lean Democratic.” The Rothenberg Political Report includes the race in one of its 86 seats in play, but rates it as “Democrat favored,” the strongest rating it gives to a seat on its radar.

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