[JCBreckenridge]

“Get married, then have kids?

OK, based on this answer, the solution to your problem is easy: Get back in your TARDIS and set the thing for a year with a better economy.”

Why don’t I simply kill Obama and Romney and we’d have President Santorum?

[FredZarguna]

a) Too risky. More likely we'd have President Hillary. No improvement. b) You don't want to do murder for a job ["Profits a man nothing," etc., etc...]

Much more satisfying and much simpler to set the Way Back Machine for 1982. Killer economy. Great President. Only downside is no FR.