Judging from this comment on his Twitter feed, it appears Indiana GOP Sen. Dick Lugar will be announcing his reelection bid sometime today.

Lugar has had a long and distinguished career, but he may turn into the Arlen Specter of this cycle. I don’t mean a party switch, but in his home state, the ground is shifting beneath his feet, and he’s responding with some irritability. He’s told the Tea Parties to “get real!“, he has voted for Sonia Sotomayor and Elena Kagan, he voted against earmark reform, he wants to bring back the Assault Weapons Ban.

Interestingly, lately he’s made a splash by loudly opposing the U.S. war kinetic military action in Libya. He’s also sitting on enormous cash reserves in his campaign fund; more than $3 million in cash on hand.

Richard Mourdock is, for now, the lone Republican running against Lugar in the primary.