/johnny
Gingrich and Santorum have suspended their campaigns. It was probably a done deal when Santorum suspended. He was the only conservative who had any success in beating Romney.
It's over. Now it's a choice between Obama, Romney and whatever small party candidates get on the presidential ballot in your state.
As for write in votes, they're almost never reported on, and in some elections I've seen them classified as "other" with no public record of who the protest votes went to. If you do a write in you really are throwing away your vote.
Not trying to be a downer here, but we have to be realists about our options.