They may call this the Sunshine State, but the political climate going into Tuesday’s presidential primary was looking plenty stormy Sunday, as the top Republican contenders stepped up their personal attacks on each other.

The increasingly combative Mitt Romney, having opened up a double-digit lead­­ in two new polls, was looking to finish off rival Newt Gingrich with a withering line of assault that characterized the former House speaker as a whiner who has been rendered unelectable by his own questionable ethics.

And Gingrich, desperate to avoid a rout in the biggest primary contest so far, called the former Massachusetts governor both a liar and a liberal.