Yes, Romney is a dick for betraying Life, but with all due respect, I think your strategy and low regard for the moral integrity of those on the Right is way off base.
Before completely immersing yourself in the reelection of Obama, understand you would be granting him another 4 years of EOs, CiC, representation of Foreign Policy, Justice, judicial appointments, etc, and two solid years of defaming the GOP Houses leading up to the 2014 mid-terms.
And, Romney is much more likely to get liberal legislation passed than Obama. RINOS who would oppose tax increases, amnesty for illegal, climate change legislation, etc. if Obama proposed any of those things will not hesitate to support any of that if Romney is twisting their arm.
Judicial appointments? Romney is almost certain to move the Supreme Court to the left, not the right. Scalia and Kennedy, who would remain on SCOTUS if a Obama was reelected will almost certainly retire and, chances are, Romney will nominate justices to the left of Scalia and no better than Kennedy.
I'll take my chances with a growing conservative majority and public backlash against Obama rather than Romney dooming the Republican party and conservative movement by infecting both with liberalism.