Well, does it mean that Senators do not vote according to their true views anymore? Will 100% votes become a norm? Should we encourage this trend and punish the dissenters?
No, it is merely an attempt to draw a correlation between vote patterns and the upcoming election. Seantors (and all politicians) most often vote the way they think will result in the most constituents voting for them in the next election. When a controversial vote like this comes close to an election, it is interesting to see which way Senators vote and then whether or not it affects their election.