Dan's the one who's right here -- Article 1, Sections 2 & 3: "the House shall have the sole power of impeachment"; "the Senate shall have the sole power of impeachment" (italics added)
Senators and Congressmen are federal officers and cannot be removed from office save for "high crimes and misdeamors". Any state recall laws would be unconstitutional and challenged (most likely successfully) by a person they tried to remove; the powerful protect each other.
"War is an ugly thing but not the ugliest of things; the decayed and degraded state of moral and patriotic feelings which thinks that nothing is worth war is much worse. A man who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself."
John Stuart Mill