November 1, 2005 -- Here he is as you've never seen him before — the one and only "Salsa Sharpton."

The Rev. Al Sharpton is dancing his way through a new campaign ad on behalf of Fernando Ferrer.

As salsa music blares from a boombox on the street, Sharpton shakes his hips to rev up support for Ferrer's uphill campaign against Mayor Bloomberg.

He hoofs across the screen and then appears again as the jingle declares in Spanish, "Fernando Ferrer for mayor — he's the one." Sharpton never speaks in the commercial.

The salsa tunes are a reminder that Ferrer would be the first Latino mayor.

The Sharpton spot was taped about a month ago — before tensions surfaced between him and Ferrer.

Sharpton endorsed Ferrer before the Democratic primary, and he was the candidate's chief attack dog who blasted Bloomberg for blowing off the first mayoral debate at Harlem's Apollo Theater.

But their alliance frayed last week, after Ferrer came out against the proposed Brooklyn Nets Arena and housing complex.

Sharpton, a backer of the project, blasted Ferrer for playing "politics" with a strong economic-development, housing and construction-jobs program.

Meanwhile, Bloomberg began his own ad blitz.

Having already spent $64 million on his re-election campaign, the mayor is stepping up the pace in the homestretch with targeted mailings, saturation TV ads and a quiet radio attack on Ferrer.

An Italian-American voter in Queens received two pieces from Bloomberg in a single day last week, including one that featured a full-page photo of former Mayor Rudy Giuliani.

Giuliani is popular among middle class white voters - particularly Italian-Americans and Catholics.

Security is the main theme of a separate flier aimed at Jewish voters, which includes a photo of a yarmulke-wearing mayor playing with a Jewish boy wearing a skullcap.

On the airwaves, meanwhile, he unleashed an attack ad, played on black-oriented radio stations, which accuses Ferrer of being a flip-flopper on issues like the death penalty.

"Newspapers report that Ferrer has flip-flopped on the death penalty, abortion. Flip-flopped on the homeowner tax rebate . . . Ferrer has flip-flopped on issue after issue after issue," the ad's narrator says.