The first was immigration reform and the second was Obamacare.
Talk radio won the immigration debate. America has always been divided on the issue of immigration. Most Americans are immigrants and they don't feel the doors should be closed to anyone who wants to come here and work hard. Another group of Americans, who were part of the rise of labor unions in the 1880's believes that immigrants take away jobs from existing workers. The most hostility toward immigration has come from Irish immigrants against Chinese immigrants from 1880 to 1940. The most severe legal barriers to immigration were raised during the peak of union power from 1925 to 1960.
Talk radio changed the debate recently and focused on Mexican immigrants who walk across the Southern border. The argument was that as long as we don't control the border, we can not discuss the level of acceptable immigration. That argument was a winner. In the past week, regarding Arizona, 2/3rds of Americans expressed the 'close the border' argument and agreed with it. The 'close the border' argument was helped by the 9/11 Islamic terrorist attack.
Talk radio also made two points about the Obamacare debate. Now 2/3rd of Americans can express and agree with the talk radio position: (a) Obamacare is too expensive for the government and will create massive debt. (b) Obamacare is bureaucratic and will consequently not save money.
Those two points are understood and accepted by the overwhelming majority of Americans. They will not be forgotten come November 2nd because they are points raised and won in a year-long argument. There is a subset of Americans, maybe 40% of voters, who also believe that the Obamacare legislation was passed against the will of the people.
Talk radio won two arguments and will probably win more in the future.