Forgive me for failing to see anything “conservative” about shoving one’s personal moral views in every State’s face.
The shoving is being done by liberal legislators and judges, often despite their constituents' wishes and/or the overwhelming majority of votes... We've seen this in several states and/or court circuits.
... but if the majority of another state’s taxpayers want to re-invent English and history, it’s their poison to drink.
That may be true in case of abortion (which BTW, thanks to few justices in SCOTUS years ago in Doe vs Wade, is not up to the states) but in the case of definition of "marriage" it's not only being imposed on the taxpayers and voters of those states who voted against it, but it's also coming to a state near you because some judge will decide that their votes also don;'t count and that the state and the taxpayers / voters / citizens of that state will have to "recognize" the marriage... because of (fill in the language of the decision of the federal judge in CA / MA / AZ / etc. on "equal protection under the law") and you will "not have the standing to appeal it").
Translation: it's being shoved now in your [state's] face and they tell you that you need to, effectively, shut up because you don't have the "right" or the "standing" to do anything about it.
I’m against same-sex marriage and would vote to preserve marriage’s proper definition in my state...
If that's what you want, then you should see that "recognizing" definitions and the rights of "marriage" is no longer going to be up to individual states, no matter what their constitution or voters / citizens / taxpayers or legislature said, by judicial fiat. We can start changing that and doing something about it now, or wait until they shove it in your face.
Liberals spend years and decades to reach their goals, use every opportunity available to them to buy votes, change perceptions, pervert definitions or subvert and nullify laws. Conservatives don't wake up until it's too late and then spend their time powerlessly grumbling about fait accompli and talking about anger and "pitchforks".
Now is a great time to not only do something about these "cultural" / "social" / "moral" issues on the level where it will count, but also use these liberal overreaches as the chance to take back the GOP. The DOMA definition of marriage, English as a national language (not forbidding others, but requiring a single unified one) and clarification of 14th amendment "citizenship" requirement to prevent legalistic abuse of it for pure partisan political purposes are not really socon issues - they are the ones that overwhelming majority of people (but not "elite") actually do or can agree on, because they understand that these are good for the country overall.