CAIRO/LONDON (Reuters) -When Tony Blair was first tasked with forging a lasting peace between Israel and the Palestinians in 2007, the White House cautioned that the former British prime minister was not "superman" and "he doesn't have a cape". After failing to achieve much of note in that role, Blair is preparing once again to tackle one of the world's most intractable conflicts after agreeing to serve on a committee led by U.S. President Donald Trump to run Gaza. Blair's inclusion sparked disbelief among Palestinian politicians and analysts, and among many attendees at the annual conference of his own Labour Party in Britain - his reputation forever sullied by his decision to back George W. Bush's 2003 invasion of Iraq.