The history of Labor Day (you know, why we celebrate): Labor Secretary Hilda Solis hits all the right talking points in her Labor Day message — jobs, unions are awesome, investment in education and training, protecting unemployment benefits and collective bargaining — but one is left wondering how much the rhetoric is backed up with bold action and significant funding: And, on the lighter side, David Letterman’s Top 10 Obama Labor Day Plans (pay particular attention to No. 2):