The final report of the New Hampshire Capitol Corridor Rail & Transit Alternatives Analysis came out earlier this month.  The alternatives can be compared in this matrix from the report.

Governor Hassan spoke in favor of extending commuter rail from Boston into New Hampshire, both in her inaugural address and her 2015 budget address.  You can also hear her strong support about 39 minutes into this recording of NHPR’s The Exchange on the topic of the state budget.

Business leaders in Nashua and Manchester expressed their support for commuter rail in this article.

Transport NH feels strongly that commuter rail will bring benefits to New Hampshire’s people and economy, and is a vital part of an integrated, modern transportation system.

The report can be found in its entirety here.  You can also download a short summary here.