Looking over the D candidates for WA-08 (The ones that matter and have a chance, IMO):
-Mona Das - Seems to be the most progressive, but also has raised the least money and seems to be running the weakest campaign.
-Jason Ritterreiser - Good background in being from Ellensburg, good presentation, not incredibly specific on policy, basically Generic D but that's a lot of Washington politicians. I think the strongest option.
-Kim Schrier - Leading the fundraising thanks to an EMILY's List endorsement. Running on more of a centrist platform. Is also the CONFRONT RUSSIA candidate in the race. My least favorite, which means she'll probably crush the primary.
-Stephen Hader - Wonky progressive, helped write the ACA, running a grassroots campaign, it's a shame he's so incredibly unlikable personality wise.
Where are you getting the fundraising #s from? Ballotpedia isn't providing any.
Greenpapers has fundraising. Opensecrets too. FEC website as well.