What is the meaning of "Omed Al ha'Amud"?
Rashi: [He stood] in his [special] place in Beis Hashem. (Refer to 11:14:1:3*.)
Radak: He stood near the pillar. Also "v'Zavachta Alav" (Shemos 20:21) means near it, and "v'Alav Mateh Menasheh" (Bamidbar 2:20) means near it.
Targum Yonasan: Ka'eim Al Istevana. Radak - i.e. he stood on a bench that great officers sit on. Yonason holds that the bench had an esteemed place for the king to stand; therefore it is called Amud. 1
Radak: Also in Divrei ha'Yamim II, 23:13 it says "Al Amdo", i.e. the proper place for him to stand. (Our text there says "Amudo" - PF.)
Why did she say "Kesher Kesher"?
Rashi: There is a rebellion here!