Reuters: Congressional lawmakers proposed a consumer incentive on Wednesday to help revive slumping auto sales and get the oldest, most polluting and less fuel efficient vehicles off U.S. roads. Industry executives and automaker lobbyists believe bipartisan “Cash for Clunkers” initiatives introduced in the House of Representatives and Senate offering up to $4,500 toward the purchase of a new vehicle is likely destined for economic stimulus legislation now taking shape. “We face real …