By Lynn R. Mitchell
Something in the Republican Party of Virginia State Party Plan covers Republican members who support those other than the GOP nominee….
UPDATE: Article VII, Section C. Removal. This section of the Party Plan is applicable in this situation. (The previous section that was listed has been removed to avoid confusion.)
A member of an Official Committee is held to a higher standard of support for nominees of the Republican Party than an individual who merely participates in a mass meeting, party canvass, convention or primary. Therefore, a member of an Official Committee is deemed to have resigned his Committee position if he (a) makes a reportable contribution to and/or (b) allows his name to be publicly used by and/or (c) makes a written or other public statement in support of a candidate in opposition to a Republican nominee in a Virginia General or Special Election. Such member may be re-instated by a majority vote of the other members of the Committee.
Calling Chairman John Whitbeck. Read more of the Party Plan.
LynnRMitchell.com 
I started the write-in campaign and resigned from the party before I began it. I did so because the incumbent I could not support had violated the party plan by supporting Democrat nominated candidates against Republican nominated candidates on four separate occasions and neither resigned from the local party committee nor was removed for those breaches.