Well they can stand on the sidelines and complain or maybe they can get involved
with the decision making process thru American Conservative Union. In other words
go to the head and get involved enough to influence the process.
http://www.conservative.org/about-acu
How can I get elected to the board of directors?
On a more realistic note, we conservatives in flyover country who don't have the big bucks to be part of the GOP establishment can and routinely do get very involved on the local level, especially looking to find and get behind conservative candidates.