Republicans knew early in 2012 that they were staring at demographic obsolescence, and that the only way to stave off a prolonged trip to the electoral wilderness was to broaden their base, and adopt a more liberal stance on immigration. Instead, the party tacked to the right, and handed President Obama a second term in the White House. The cause and effect were obvious long before Election Day, and the GOP deliberately chose a losing path -- both for the short and the long term. Two years later, Republicans face a strikingly similar choice. They’re doing everything they can, nationally, to snatch defeat from the jaws of victory. And in Massachusetts, there’s a clear undercurrent pushing the GOP’s brightest political hope, Charlie Baker, to follow suit.