What Democrat could we nominate to run against our wimp of a president Obama at the Democratic convention?

Obama is a wimp as a president. He has caved-in to the repuglican plutocrats on practically everything that has come up. If he had a disease that required him to take two doses of medicine each day, I am afraid that he would only take one dose, if the repuglicans told him too. What we need is another Franklin Delano Roosevelt, and I am not sure who that might be. If we had a Republican like Dwight David Eisenhower running, I would vote for him over Obama, and I have been a dyed in the wool, bleeding-heart liberal, progressive Democrat all of my adult life and I am 75 years old. I believe that 2012 will be the very first time that I will not even go to the polls. I do not see much difference between Obama, a half-way president, and a half-a**ed repuglican plutocrat.