Last night's telecast of "The Tonight Show with Jay Leno," featuring a guest appearance by President Barack Obama (11.2 household rating, 26 share), has achieved the highest "Tonight" rating in metered-market households since Monday, January 24, 2005 (11.2/26), the night of a special tribute to Johnny Carson, according to in-home viewing figures from the 56 local markets metered by Nielsen Media Research. The last time Jay Leno scored a higher metered-market rating than last night's 11.2 was Thursday, May 14, 1998 (12.4), the night of the "Seinfeld" finale. Last night's historic edition of "Tonight" matched the fourth highest metered-market household rating in the more than 16 years Jay Leno has been hosting "Tonight." President Obama's appearance last night is the first for a sitting U.S. President on a late-night talk show. Also appearing on last night's show was music superstar Garth Brooks. Last night's telec...