Anyway, foreign policy matters very, very, very little to Americans. To understand foreign policy requires understanding that there are such things as foreign countries, and that is a tall order for most Americans (including so-called "political junkies"). Obama has merrily continued many Bushian military blunders and launched a few of his own. Most Americans aren't even aware of these debacles, and those who are only care if they identify as Republican. As for the "it's the economy, stupid" chestnut: NO IT ISN'T, STUPID. Social media has made the "social issues" the only issues that matter. Everyone, Republican or Democrat, is now a values voter. Even economic issues are now framed in terms of race and gender.
With all that said, below is a list of why the various Republican contenders cannot win. The moment any of them ascend towards relevance the media will turn the policies/comments detailed below into social media blitzkriegs.
Why Scott Walker won't be President:
Wisconsin governor Scott Walkers signs abortion bill requiring ultrasound
Why Rand Paul won't be President:
Discussion of Civil Rights Bills with Rachel Maddow
Why Rick Perry won't be President:
Court upholds Texas abortion law, closing 13 clinics
Why Chris Christie won't be President:
New Jersey Defunds Planned Parenthood
Why Mike Pence won't be President:
Why Marco Rubio won't be President:
These liabilities alone guarantee none of these "contenders" can win California, Massachusetts (all of New England except maybe New Hampshire and even that "Live free or die" state looks unpromising for Republicans), New York, Connecticut, New Jersey (yes, New Jersey - Chris Christie is going nowhere), Illinois. and Pennsylvania. That right there makes a Democratic victory almost inevitable. Presidents aren't decided by popular vote, and the only big red state is Texas. All the other biggies are pretty well sewn up for Democrats regardless of the candidate. There will never be another pro-life (or even socially conservative) president, no matter how many bleach-toothed "centrist" Republican "messiahs" the media tries to gussy up.