I couldn't disagree with you more. Look at what multiple parties has done to Europe. The party with the largest segment of lunatics wins. No, keep the culling within the Republican party. Hopefully, get the best candidate on the ticket. On election day, vote Republican. Even a lousy Republican is better than a Democrat. Pelosi would be a national nightmare.
The Libertarians are for abortion, open borders, the legalization of all illegal substances and prostitution and their candidates are barking moonbats.
Then, there's the Constitution Party, who are worse than the Birchers ever dreamed of being and want a theocracy.
Or are you thinking GREEN? ;^)