Washington - President Obama launched a push to extend Bush-era tax cuts for the middle class for just one year as he seeks to shift the election-year economic debate from the dismal jobs market to assertions that Republican rival Mitt Romney protects the rich. Obama, in an address from the White House, called on Congress to pass a one-year extension of tax cuts for households making less than $250,000 a year. (Snip) The Bush-era tax cuts are due to expire at the end of the year unless Congress votes to extend them. Economists worry that across-the-board tax increases, along with