What political affiliation does Brian L Roberts have?

Well I haven't found a complete answer myself but from a quick search of his campaign contrubution record, most of his donations have gone to Democrats. Including some fairly left wing candidates.

I ask the same question myself now that Comcast has acquired NBC.

I just read that Comcast already owns MSNBC, so knowing that MSNBC is about as far to the nut job communist left as you get and since Comcast doesn't reign them in with some balanced coverage, this might be another circumstantial indicator of his political leanings.