a. Senate Narrowly Defeats Keystone XL Pipeline a to help Senator Mary Landrieu’s (D-LA) prospects yesterday rejected the Keystone XL pipeline one vote short a a yesterday rejected the Keystone XL pipeline a a. Senate Narrowly Defeats Keystone XL Pipeline to help Senator Mary Landrieu’s (D-LA) prospects back-and-forth a. Senate Narrowly Defeats Keystone XL Pipeline (NYT) Senate Narrowly Defeats Bill on Keystone Pipeline a. Senate Narrowly Defeats Keystone XL Pipeline