One of the left’s deepest prejudices is that its opponents are stupid, and Cruz tramples on it. Chris Hayes of MSNBC actually says he fears Cruz’s brilliance. So should congressional witnesses. At hearings, Cruz has the prosecutorial instincts of a … Harvard-trained lawyer. Watching Attorney General Eric Holder try to fend off Cruz’s questioning on the administration’s drone policy a few months ago was like seeing a mouse cornered by a very large cat.

Cruz hasn’t played by the Senate rules that freshmen should initially be seen and not heard. In fact, he joined the upper chamber with all the subtlety of a SWAT team knocking down a drug suspect’s front door.

For people who care about such things — almost all of them are senators — this is an unforgivable offense. At another hearing, this one on guns, as Cruz says the highest commitment of senators should be to the Constitution, another senator can be heard muttering that he doesn’t like being lectured. Chairman Pat Leahy (probably the mutterer) eventually cuts him off and informs him he hasn’t been in the Senate very long.

Cruz lacks all defensiveness about his positions, another source of annoyance to his opponents, who are used to donning the mantle of both intellectual and moral superiority.