They were once bitter political rivals; now they have joined forces to help victims of the Indian Ocean tsunami.Former US presidents George Bush and Bill Clinton have arrived in Thailand on the first leg of a regional tour. They will visit four nations, including Indonesia, the country worst hit by the wave which may have killed a total of 300,000 people. The two men were appointed by current President George W. Bush to lead private US fund-raising efforts for survivors. There were emotional encounters with the people of Ban Nam Khem. a fishing village which lost nearly half of its population on December 26. The ex-presidents were presented with harrowing drawings of the tsunami by children who lost their families. Bill Clinton has recently warned that, while private donations have been encouraging, donor fatigue is now a major challenge.