Kevin Drum thinks Obama's Immigration Plan is Both Good Policy and Remarkably Shrewd Politics. He makes some good points.
Republican leaders are not only fearful of next year's primaries branding the GOP forever as a bunch of xenophobic maniacs, they're afraid it's going to wipe out any chance they have over the next two years of demonstrating to voters that they're a party of adults. Here's the LA Times:
Republican leaders who had hoped to focus on corporate tax reform, fast-track trade pacts, repealing the president's healthcare law and loosening environmental restrictions on coal are instead being dragged into an immigration skirmish that they've tried studiously to avoid for most of the last year.
The upside, conversely, is potentially huge. Obama has, indeed, waved a red flag in front of congressional tea partiers, turning them into frothing lunatics who want to shut down the government and maybe even impeach him. This has already turned into a huge headache for John Boehner and Mitch McConnell, who really don't want this to be the public face of the party. In addition, it's quite possibly wrecked the Republican agenda for the next year, which is obviously just fine with Obama. And it's likely to turn next year's primary season into an anti-Hispanic free-for-all that does permanent damage to the GOP brand. And that's not even counting the energizing effect this has on Democrats, as well as the benefit they get from keeping a promise to Hispanics and earning their loyalty for the next few election cycles.
He thinks the downside is minimal because GOP leaders weren't going to work with Obama on anything significant (including appointments) and for anything they were willing to work on, Democrats don't want anyway.