I doubt it - Bob Kerrey is a pompous, thin-skinned egomaniacal jerk. He was probably outraged that some "little people" actually had the temerity to wave their anti-Rat signs in his sainted presence. That explains why he snapped. Why would he sweat a little thing like another Rat being caught in a lie? It's not like he or any of his fellow Rats are going to suffer any consequences after all.
Unless Sandy sings