The Liberal Democratic Party won a sweeping election victory Sunday, securing an overall majority in the 127-seat Tokyo Metropolitan Assembly with its coalition partner New Komeito, giving Prime Minister Shinzo Abe a vote of confidence heading into the crucial Upper House election next month.

Driven by high expectations for Abe's economic policies, dubbed "Abenomics," the LDP is aiming to build on the momentum to win the House of Councilors election in July, when the prime minister will be tested on his handling of the seven-month-old government.

The LDP and New Komeito are aiming to win control of the Upper House so that they no longer need to rely on opposition support to pass legislation.