Why do Senators not keep their promises? 
Do we expect this of Democrats?
If they are supposed to be better, then why should Republicans complain when being reprimanded by the President for not doing their jobs and keeping their promises to the voters?

Trump works huge hours every day and then takes his work with him.
 Congressmen & women hardly spend any time actually doing their work.
Why has Trump accomplished so much since taking office and Congress so little?