Which two GOP candidates would create the longest primary?

[Badger]

In any of these "X vs. Paul" scenarios I have a hard time seeing how Paul can go the distance. His optimal strategy was to take the "true conservative" mantle vs. whoever the relatively moderate establishment candidate turned out to be, but given his recent statements about abortion, Reagan, etc., it's hard to envision how that happens.

How does he significantly expand his base beyond his dad's supporters plus a few more like-minded GOP primary voters who were scared away by Ron's craziness "occasionally eccentric style"? Those numbers are MAYBE a way to win Iowa in a heavily split field, and maybe a good showing (but winning?) in New Hampshire with that momentum. And then what? I fail to see what electoral niche he can realistically fill outside internet love if he's not running balls to the wall as "the true conservative" (a title several others will surely seek to grab......).