A candidate who solicits contributions for one office may not use those contributions to seek a different office without first obtaining written approval of the persons or entities who donated the contributions.

In other words, if a candidate decides to run for the state senate after registering and collecting money for a state house race, the candidate may not transfer that money to the senate campaign without first getting written approval from the contributors of the monetary contributions remaining in the house campaign account as well as donors of any remaining in-kind contributions.

This contributor approval process applies to “active campaign funds” (funds on hand during an active campaign) as well as using surplus campaign funds from one campaign to seek a different office.  RCW 42.17A.490.