I guess that's the difference between the Democratic party debates and the Republican party debates. I know that sounds like a troll, but it's not. The GOP primary debates had 17 people running, the Democratic primary had 5 (not counting Lessig). No one seriously thinks that Lindsey Graham is going to be the nominee, nor did anyone think that he could be the nominee when he ran. He's a single issue candidate (national security) and his agenda is make sure this issue is discussed during the primaries. The same thing with Santorum and Huckabee ("traditional values"). It's not a new phenomenon. Back in 1988, Pat Robertson ran with a "Christian conservative" agenda, but no one seriously thought that he was going to be president. His role was to highlight the power of the conservative evangelical Christians in the Republican party, thus causing the eventual nominee to (and the party as a whole) to pay attention to their issues. There's nothing with this tactic, and it may even be effective. But it seems like it's more prominent on the national stage in the Republican Party than the Democratic Party.