WASHINGTON (MarketWatch) - House Republicans prevailed Thursday in passing legislation that extends around $56 billion worth of tax cuts through 2010, including lower rates on corporate dividends and capital gains set to otherwise expire in 2008. The House passed the bill on a 234-197 vote, delivering a legislative victory to President Bush, who contends the 15% rate on dividends and capital gains first enacted in 2003 have been crucial to the economic recovery. "Tax relief for dividends and capital gains has contributed directly to the strengthening of the nation's economy, which has created over 4 million new jobs since the...