Republic National Committee Chairman Michael Steele says Sen. Byron Dorgan's decision not to seek re-election "highlights just how vulnerable both Senate and House Democrats have become" since President Obama took office. Here is Steele's statement, released Tuesday: “Today’s announcement by Senator Byron Dorgan of North Dakota that he will not seek reelection in 2010 highlights just how vulnerable both Senate and House Democrats have become since deciding to walk in lockstep with President Obama’s government-run policies. "For nearly a year Congressional Democrats have been turning a deaf ear to the concerns of the American people and as the elections of...