Newly instilled Nationals leader Michael McCormack concedes he's got a big challenge ahead having taken over from Barnaby Joyce amid scandals that have engulfed his party and the Federal Government, The Labor party has pledged $150 million to create a new South Australia Ports Authority, if elected, which will oversee the development of ports, Water brokers say the Senate's decision to block changes to the Murray Darling Basin Plan will impact water prices in future.