Writting a letter for sponsorship

Say you wanted to do something like Race for Life to raise money for cancer research but struggled getting much money from friends and family, could you write a letter to companies asking them to sponsor you?
If so how would you word the letter and what sort of companies would you send it to?
If so how would you word the letter and what sort of companies would you send it to?
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Comments
I have done Race for Life twice now and only asked friends and family. I dont think it matters how much you raise you feel good having helped even if it isnt much. I dont think you will get much response from companies as those that give to charities probably have set ones they already give to.
Oke, that was unrelated, but there, I said it anyways!
The company will match the donation given by it's employees.
Does any of your friends work for these organisations?
I know that of the following companys do it
Lloyds tsb
Powegen
National Grid
there are more...
try the attached link - it may have names of companies...
http://www.grant-tracker.org/knowledgebase/what-matched-giving