Associated Press: Democratic senators want BP to set aside $20 billion to pay for cleanup and other costs from the Gulf oil spill. Senate Majority Leader Harry Reid, D-Nev., plans to send BP a letter on Monday proposing the account. That’s two days before BP executives meet with President Barack Obama and three days before chief executive Tony Hayward testifies at a House hearing. A copy of the letter was released Sunday by Reid’s office. BP has promised to pay for damages. But Obama also …