Charlie Crist’s hiring of the SKD Knickerbocker media firm is another sign the Republican-turned-indie guv is making a serious play for Democratic votes in his U.S. Senate bid.

Crist has already signed “fire-breathing liberal” Democrat Robert Wexler’s former political consultant, Eric Johnson, to help him in Dem-heavy South Florida.

SKD Knickerbocker’s partners include Anita Dunn, a senior adviser to Barack Obama’s 2008 presidential campaign, and its website boasts that it has “helped countless Democratic candidates and campaigns navigate tough races and win.”

Its client roster includes Obama, Democratic Sens. Sherrod Brown and Jay Rockefeller, Orlando-area Democratic U.S. Rep. Suzanne Kosmas and the para-Democratic Service Employees International Union.

The firm has also handled big-time indie campaigns for Connecticut Sen. Joe Lieberman and New York Mayor Michael Bloomberg.

Whether they’re running for president or a state House seat, Republicans in need of campaign cash often find their way to Bill Diamond’s Palm Beach home.

Florida Attorney General and 2010 governor candidate Bill McCollum will be the latest GOP office-seeker to belly up to Diamond’s political ATM when he attends a fund-raising lunch there Wednesday.

A veteran of New York City Republican politics, the 73-year-old Diamond co-owns a real estate business and was elected to the Palm Beach town council this year.

He was a regional administrator for the U.S. General Services Administration under Presidents Reagan and George H.W. Bush, then was former New York mayor Rudy Giuliani’s commissioner of administrative services from 1994 to 2001.

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