I just looked up the Q2 FEC filings by both candidates:

Sali raised $543k Total for the year up to that point, and had $92k Cash on Hand at the end of June.  This includes a $3700 personal loan to his campaign.

Grant had raised $217k, but that includes a $56k personal loan.  He had $74k Cash on Hand at the end of June.

My guess is that Idaho is not an expensive media market and a candidate could wage a decent campaign with $200k.  However, Sali has the infamous "Club for Debt" on his side, and those folks can funnels thousands into his campaign in short order, and this would be in addition to the new RNC push.

I hope the DCCC understands that a little funding could go a long way here.  Better to give $50k to this race than to add another $100k to a race where the candidate already has over a $1 million.  There is a law of diminishing returns at some point.

The Dems are in this race because Sali is a nutjob and Grant is reasonable.  We can thank the Club for Debt for giving enough support to the nutjob to put this seat in play for the Dems.