Alternatives to McClellan? Democratic Options in 1864

We are now upon the 150th anniversary of the Democratic presidential convention of 1864. That convention nominated George McClellan and George Pendleton of Ohio as the Democratic ticket on a platform framed largely by Copperheads such as the recently-returned Clement Vallandigham.

Could the Democrats have done better? Tell me how. I wonder how the platform could have been different. Could Democrats have reached out to recover more members of their party by passing a more moderate platform on the conduct of the war without alienating the peace wing of the party (which, after all, had nowhere else to go unless it wanted to see a divided Democracy hand the fall contest to Lincoln). Was there a better choice than McClellan? You tell me.