A CNN.com journalist has begun his bid to "tweet" the London Marathon — but admits he has no idea whether his plan will work. Pete Wilkinson, a digital news producer at CNN.com in London, plans to update his Twitter page during Sunday’s race via text messages from his cellphone but said that typing and running at the same time was “incredibly hard.” Wilkinson hopes to complete the iconic 42.1 kilometer (26.2 miles) race in four hours or less and said he planned to tweet without stopping
