He’s about 75% there. He’s a gonna run, IMO
You'd better come-up with a back-up plan real quick.
Banking the idea that “Jim Demint hasn't sworn-off running SO HELP HIM GOD = he's running!” is going to lead to a lot of heartbreak, and a lot of last-minute scrambling to find another Romney backer to oppose Palin (or maybe just Romney himself).
DeMint isn't running, no matter how much you really, really want him to.