On a conference call with House Republicans a day after the party’s electoral battering last week, Speaker John A. Boehner dished out some bitter medicine, and for the first time in the 112th Congress, most members took their dose. Their party lost, badly, Mr. Boehner said, and while Republicans would still control the House and would continue to staunchly oppose tax rate increases as Congress grapples with the impending fiscal battle, they had to avoid the nasty showdowns that marked so much of the last two years. Members on the call, subdued and dark, murmured words of support — even...