Interesting Graph on a Tale of Two Montana Senators

Athough the warning is to Senator Blanch Lincoln (D-AR), the graph examining the fates of the two Montana senators is fascinating.  One, Baucus, relished the attention he has gotten as chair of the Finance Commitee.  The other, Tester, has been very quiet.  Which one do you think has suffered?  The one at the middle of the now-vitriolic health care debate.  Maybe Ben Nelson (D-NE) and Joe Lieberman (?-CT) should heed the advice that Nate Silver is giving: just shut up and take a position, unless you wish to kill your political future...