Say that Theodore Roosevelt, growing irate at the rightward swing of Taft after taking office as President in 1909, goes to you with the idea of founding a party to protect and advance the gains made with the Square Deal, and he asks for your advice on how to have it gain a lasting presence in American politics, saying in as many words that he doesn't expect to live for many more years and wants American Progressivism to be a major force even when he's gone (This is already a bit of a change, since he's dedicating himself to starting a new party well before 1912, when IOTL it only got off the ground after he lost the Republican Primary to Taft). Would would you tell him to do, what strategies this new party aught to follow?