Mitt Romney's late push to win Pennsylvania is a "desperate ploy," White House senior adviser David Plouffe said Sunday.

"I mean, to win Pennsylvania, Governor Romney would have to win two-thirds of the independents," Plouffe said on ABC's "This Week With George Stephanopoulos." "He's not going to do that anywhere, much less Pennsylvania.  So the truth is, they are throwing some ads up and Governor Romney is traveling in the state he's not going to win."

Recent polls have generally showed Obama leading slightly in Pennsylvania, but Romney is making a stretch run effort there to steal the state away from the Democrat. The Republican nominee is stumping in the state on Sunday, while running mate Rep. Paul Ryan (Wis.) campaigned there Saturday.

Romney campaign political director Rich Beeson said the Romney campaign is optimistic about its chances in the Keystone State. “Pennsylvania is very fertile ground for us,” Beeson said on "Fox News Sunday."

Plouffe said he is "confident the president has the electoral votes to win" on Tuesday, and argued that Romney doesn't have the high ground moving toward Election Day. 

"I think a lot of this is a smoke screen, to try and mask the fact that in the places that will decide this election from an electoral college standpoint, Ohio, Iowa, Wisconsin, they are -- it's going to be close, but they are definitely in a weak position heading into election day," he said.