[R] enable object name to be called as object (a dataset)

[runner]

What I am trying to do is as follows:

- I have listed names of all wanted objects (datasets A,B,C... ) in current
workspace as a vector: 

obj <- c('A','B','C')

- then i need to use these objects, say to extract all the 1st columns and
bind to an existing dataset ('data'): 
 
for ( i in 1:3){
newdata <- obj[i] 
data <- cbind(data,newdata [[1]] )
}

Obviously, it doesn't work since obj[i] is just a string of dataset name.
Here is my question: how to call it as a original dataset? Thanks.
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