NEW YORK (AP) — With the announcement that Stephen Colbert will be the new host of CBS' "Late Show," his fans likely feel a clash of emotions: He hasn't just satirized politics and culture, he has rolled up his sleeves to organize a "Rally to Restore Sanity and/or Fear" on Washington's National Mall with his Comedy Central colleague Jon Stewart, and to create a super PAC to draw attention to the tyranny of money on elections. [...] he has done it all behind a mask — the mask of "Stephen Colbert," a pompous, clueless conservative pundit who, to his admirers, seems a funhouse version of a Fox News Channel star. [...] his genius has been largely exhibited, and his reputation sealed, through the "Stephen Colbert" persona he has played to perfection on "The Colbert Report" since its debut in 2005, and for eight years before that as a bloviating "correspondent" on the Stewart-hosted "Daily Show." Through it all, he stays in character — the "Stephen Colbert" character — with only a twinkle in his eye to let his audience know HE knows that most of what he utters is purposely dimwitted or wrong. [...] his main rivals will still be in the bloom of youth: NBC's "Tonight Show" host, Jimmy Fallon, will be 40 or 41; the host of ABC's "Jimmy Kimmel Live" will be 47 or 48. [...] what political baggage will Colbert bring to CBS, even as he ditches his "Stephen Colbert" role? [...] just hours after Colbert was named the new "Late Show" host, conservative commentator Rush Limbaugh was growling that "CBS has just declared war on the heartland of America." [...] ideology has never been at home on major late-night talk shows, which traditionally shoot for reassurance and diversion.