Well lets be real shall we, the Accord Hybrid plug in starts at 40k. It is priced within the reach of far many more households than the Tesla or Mercedes are. Then to top it off, I doubt the tax payers are ponying up 7500 dollars towards its purchase, so its a double win.
My 2005 Prius has a 1.3kwh battery. A 2014 hybrid can do much better - not to mention the fact that it doesn't sound like it's aggressively managing battery life like my Prius does (which still gets 53 MPG highway).