Leading Democrats are putting together fallback proposals if Washington fails to reach a deal on the “fiscal cliff” that would allow the party to cast itself as seeking to cut taxes. “Of course, I’ve got a backup plan in the event that we don’t succeed here,” Sen. Max Baucus (D-Mont.), chairman of the Senate Finance Committee, said Friday. “I’m sure the White House has one too.” Tax rates are set to expire on most households in January if Congress does not act to extend some of the rates, something some Democrats have long seen as giving their party an advantage....