WASHINGTON (CNN) – Former House Speaker Newt Gingrich has signed on to the latest high-profile effort to re-brand the Republican Party — but don't expect to see him take a major leadership role for the National Council for a New America, or make a starring appearance at any of the events on the group's national tour. Organizers of the effort, spearheaded by House Minority Whip Eric Cantor, originally told reporters that Gingrich had not been included in the newly-launched group because his 527, American Solutions, was a partisan entity. (The organization describes itself as a "tri-partisan" network.) Gingrich supporters dismissed...