Congress has repeatedly voted down any provision that would switch their insurance plans to the lower-grade public option if Obamacare goes through.
No matter what party you support remember that at election time.
Please cite a reference to exactly how many of those votes were Republican.
My understanding was that the amendments you cite were voted down in committee along strict party lines: All Dems against; all Repubs for.
If you have different data, please educate us.