Let's get a few things straight.
It's not like Dick Lugar got ambushed.
Everyone saw this coming unlike, say, the take down of Sen. Robert Bennett in Utah in 2010 or former Gov. and Rep. Michael Castle, the mainstay of GOP politics in Delaware, losing his Republican primary to Christine O'Donnell, she of witch fame.
Richard Mourdock is no O'Donnell. He's a serious guy, a state treasurer like Mike Lee who offed Bennett and is emerging as one of the most serious legal minds in the Senate. The GOP may be moving right but it's not as seismic a shift as everyone seems to be saying this morning. After all, Lugar rarely deviated from conservative orthodoxy himself, not in any decisive way since the 1980s when he opposed Ronald Reagan's no-sanctions policy towards apartheid South Africa. Guns? Abortion? Lugar was a reliable conservative.
But he had a style that could only be called senatorial. He raised the debt ceiling, voted for omnibus legislation, worked well with colleagues and had a courtly manner that was more PBS than Drudge.