A decade ago, James Lileks noted:
Nowadays, if you point out that someone’s a Communist, you might well be accused of – dum dum DUMMMM – McCarthyism. The term has morphed from its original meaning. It no longer means falsely accusing someone of being a Communist. It now includes correctly identifying someone as a Communist, or ascribing a taint to someone because they don’t reject the Communists in their midst. (I’ll admit there’s a significant difference between the two.)
Just ask Ted Cruz.
Update: "If anyone wants to compare Sen. Ted Cruz to Sen. Joseph McCarthy, I hope Senator Cruz will thank them for the compliment," Stacy McCain adds.