Politico:

Republican vice presidential candidate Paul Ryan told House GOP lawmakers in a closed meeting Thursday that this election was just like the 1980 contest between Jimmy Carter and Ronald Reagan.
Ryan said Carter lead Reagan late in the race, and Republicans have taken to comparing 2012 to the campaign three decades ago.
The problem is not comparing Obama with Carter. The problem is this: No one believes, not even the members of your own party, that Romney is Reagan.