Conservatives, Labour Party focus on economy for most unpredictable UK election

While issues such as the European Union and immigration will play a big role in the campaign in the UK election, both the Conservative Party and their main opposition, the Labour Party, are focusing their pitches on the economy.

Leon Neal/Reuters

British Prime Minister David Cameron paid a courtesy call on Queen Elizabeth II, then launched a most uncourteous attack on his main political rival as campaigning formally began Monday in the most unpredictable U.K. election in decades.