Why doesn't the White House punish turncoat Democrats?

[W]hen the history of Obama’s first term is written, conservative Democrats will also be remembered for regularly throwing wrenches into any plans coming from this president…

Obama also wants to win over independents. He could use conservative Democrats as allies.

The result is the White House never punishes the turncoats.

The Obama campaign is too busy energizing its liberal base right now with support for gay marriage, the new immigration policy and preventing student loans from skyrocketing. Those policies may be enough punishment for Democrats seeking socially-conservative independent voters.

The real question for conservative Democrats now is whether any voters will think they are not actually Democrats because of stunts such as avoiding the national convention.