I am unsure if MD has an “open” GOP primary.
The first thing I would do, if MD does, is to close the primary to only GOP voters. That would be a starting point.
The same can be said for all the other states who have open primaries. CLOSE THE PRIMARIES TO ONLY GOP VOTERS! Get rid of the Lugars, McCains, Grahams...etc.
Maryland primaries are closed. Only republicans can vote for republicans and only democrats can vote for democrats.