Changing registration to vote in a primary.

[MichMan]

8. There can be unintended consequences

That is essentially how former Michigan governor Rick Snyder won election

He was a virtual unknown businessman prior to the primary and was a surprise winner with a lot of Dems crossing over to vote for him. The prevailing logic was that since he hadn't come out with any major policy positions, he was preferred over any of the better-known Republican elected officials that were running and might be easier to beat.

Of course he ended up winning (58 %) and passed things like RTW, and tax cuts as well as the emergency manger law that ended up causing so much trouble in Flint.