Senior Congressional Democrats told ABC News today it is highly unlikely that a health care reform bill will be completed this year, just a week after President Barack Obama declared he was "absolutely confident" he'll be able to sign one by then. "Getting this done by the by the end of the year is a no-go," a senior Democratic leadership aide told ABC News. Two other key Congressional Democrats also told ABC News the same thing. This may come as an unwelcome surprise for the White House, where officials from the president on down have repeatedly said the health care bill would be signed into law by the end of the year. "I am absolutely confident that we are going to get health care done by the end of this year, and Nancy Pelosi is just...