Twitter has been rather amused by Starbucks’ plan to solve the fiscal cliff by scrawling “come together” on every peppermint mocha and salted caramel latte sold in the Beltway.

But I want to take the project a bit more seriously. I should say, at the outset, that I admire the effort: People and CEOs should want to be engaged in American politics, they should be angry at what they see happening and they should be trying to figure out ways to pressure politicians to make things work better.

But the specific sentiment — what you might call the ideology of “come togetherism” — is, ironically, one of the big reasons that nothing in Washington ever seems to get solved and that the two sides never seem to come together.