Republicans need to embrace party unity in 2012, or else. The New York 26th Congressional District race is an important cautionary tale for Republicans. Party divisions helped throw a normally safe seat to the Democrats, and you can be sure the White House is taking notes. NY-26 should be a wake-up call to Republicans going into the 2012 election season at both the congressional and presidential level. At this point, it's unclear which Republican candidates for president will be able to unite the party's various tribes, but it's certain that the easiest way for President Obama to win re-election is...