Re: I sense political meddling.
Actually, you should be sensing the US system of justice at work. The reason for the lengthy delay to examine the contents is that PRISM could not apply, as the warrants involved only covered Mr. Weiner's emails. It's the subsequent warrants that only covered the emails of Mr. Weiner's estranged wife.
For me, the fishy part is this: they claim that they had to build special software to only index and examine his emails. I understand if the existing PRISM system didn't have these types of filters available during inputs, but it's not clear what's so special about instituting an input filter that it required a separate program. I would actually expect that they spent the time adding input filters as a new PRISM feature, but who knows really.