Kerry cautious on probing `Downing Street Memo' By Noelle Straub Monday, June 20, 2005 - Updated: 10:36 AM EST WASHINGTON - Walking a tightrope on a politically charged issue, Sen. John F. Kerry vowed weeks ago to raise the controversial ``Downing Street Memo'' as an issue in Washington, but has since publicly held his tongue on the matter. Instead, Kerry has been enlisting other senators to sign onto a letter to the Senate Intelligence Committee seeking answers about the memo, aides said. The memo contained minutes of a 2002 meeting in which British officials told Prime Minister Tony Blair they...