You can trust a conservative source when it says liberal things. In this case, it is saying it is 50 instead of 51 (which it would prefer).
RCP does include Rasmussen, which is kind of questionable, and they don't include various web-based polls, some of which are very reputable. Together that tends to result in oversampling land-line types and undersampling Internet-age types, which skews their results to the right a bit, which is consistent with their editorial lean. But, that said, it is still a valuable resource. HuffPo Pollster provides a similar service and basically does the opposite- includes lots of web-based pollsters and doesn't include Rasmussen. So, HuffPo Pollster tends to error to the left a bit, which is also consistent with its editorial lean. So, my advice is to follow both and know that the actual results, if the election were held today, would very likely fall somewhere between the two.
That said, in 2012, the pollsters ALL errored to the right. So, maybe you'd actually be better off just going with the most liberal source you can find... But I think they've probably adjusted their turnout models since then.
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