Other people’s money. Of course this is going to be a popular program. They are giving away money via the car dealers.
The Clunkers"R"Us government just declared the popular 'Clunkers for Cash' CARS program a success and, before going home, "found" another $2B to extend the program. As luck would have it, the money was in the same place Congress "found" the first $1B of "free money" that people burned through faster than was expected.
Democratic (program, President, politician, policy, intervention etc.) = popular and historic Republican (program, President, politician, policy, war etc.) = unpopular and controversial