Pop superstar Madonna's Re-Invention tour has been slammed by American critics - for overloading the show with "naive" political statements. The "American Life" singer, 45, kicked off the US leg of her tour in California on Monday but failed to impress critics with her attempts to "wipe the slate clean" by ditching her trademark raunchy routines. The Los Angeles Times sniped, "This promised to be Madonna's tour de force, a reappraisal that put her work in new and revealing contexts. But time and again she fell short of the challenge." Many critics were unimpressed by the images of the Iraq...