I have used twitter search API to collect lots of tweets given a search keyword.  Now that I have this collection of tweets, I'd like to find out which tweet has been retweeted most.  
Since search API does not have retweet_count, I have to find some other way to check how many times each tweet has been retweeted.  The only clue I have is that I have ID number for each tweet.  Is there any way I could use these ID numbers to figure out how many times each tweet has been retweeted??
I am using twitter module for python.
i don't think so, since one can either retweet using the retweet command or using a commented retweet. At least the second alternative generates a new tweet id
Getting Retweet Count of a Given Tweet ID Number