Number of articles on Google News (from 6/16 to posting time) including...
There were also 6,605 articles including "McCain" & "offshore drilling" but because many of those articles -- especially the recent ones -- focus on Obama criticizing McCain on the issue, I don't think that number is particularly illustrative of any sort of bias. (It is possible that the press wants to highlight Obama's opposition to expanding offshore drilling because it doesn't poll well; however, if that is the case, I think they are making a mistake, because Obama has a pretty good case to make.)
© Jed Lewison