John Thune tells the Wall Street Journal that a long paper trail means lots of kindling for big burns.
"When you've been here a long time, which Sen. Lugar has, you have a record which consists of lots of votes, lots of positions—and certainly lots of ammunition if you're an opponent."
Speaking of Thune, it's doubtful that he'll get primaried or anything'd anytime soon. Democrats didn't even field a candidate against him in his Senatorial reelection bid, and Republicans haven't fussed at him much, either.
BUT... he did vote for TARP, has had his share of earmarks, and -- as befits his position in Senate leadership -- has done establishment-y things like defend former Senator Bob Bennett.
Which is to say: Thune is accumulating a paper trail, as well.
(I realize I've written favorably -- even today! -- about Thune's strength as a vice-presidential candidate, and I stand by that. He's still got a far more conservative record than the guy the GOP nominated).