Conservatives launch TV assault on EarleAds running in Austin liken the Travis County DA to an attack dogBy R.G. RATCLIFFECopyright 2005 Houston Chronicle Austin BureauAUSTIN - A national conservative organization today is launching a television commercial in Austin and nationally comparing Travis County District Attorney Ronnie Earle to an attack dog because of his prosecution of U.S. Rep. Tom DeLay. "A prosecutor with a political agenda can be vicious," the ad says over footage of a snarling dog.The ad, sponsored by the Free Enterprise Fund of Washington, D.C., reminds viewers that Earle, "a liberal Democrat," once tried to prosecute U.S....